Not only are all his actions entirely counterintuitive to any previously perceived goal, his choices to willingly and unnecessarily put himself in a situation (whatever the reader may imagine that situation to fully entail) which is innately humiliating and self-destructive, and generally against his nature already set him up as a deeply unwell individual.
He clearly hates the ocean, hates Valinor, and although he considers them a preferrable people to the elves, holds nothing but disdain and disgust for the men of Numenor.
If his goal was simply to conquer Numenor and thus neutralize what threatened his dominion of Middle Earth, 50 years of allowing his kingdom on Middle Earth to disintegrate while playing mistress to a king he could easily kill or replace and building up a religion based on Melkor he fully knew held no truth is utterly batshit insane.
If his idea was to prove his loyalty to Melkor, or genuinely attempt to use Numenoreans to break the door of night and release Melkor, why intentionally lead them astray with misinformation that will have them flounder, and continuously undermine his own possible force and trustworthiness by putting thousands to meaningless human sacrifice? Additionally, Sauron is not stupid enough to believe Valinor could ever be conquered by mortals. That said, he didn't exactly have any elves at his disposal post the Celebrimbor debacle, but he would very well know a plan like that was doomed from the start.
If his intention was purely to ruin a good thing out of spite, boredom, and pride, wanting it entirely destroyed from the beginning, he would have constructed proper routes that would have given him an easy way to flee Numenor, preserving his fair form and dignity, (and of course the ring) and demonstrate his point. And even if he had not forseen another rising of the sea (which he probably would, considering how impactful the first one was to him), there would be some indication of a plan for an empty or near-empty island-- he would likely have held back a portion of the King's Men or even a single empty boat to have literally any indication of intent to survive beyond its failure.
However, I don't think that he really wanted any of those things. He might not even have known fully what he did want, as I'll make a claim to say after the creation of the ring he shows barely any that vain sense of self which he prides himself on in the first age. Playing out this charade on Numenor, however, successfully serves one aim-- rashly provoking the attention of all the Valar and Iluvatar himself, who he knows even with the ring he stands not a sliver of a chance against, and who will likely not hesitate if they can to capture him, destroy him, or throw him out past the Door of Night like they did his predecessor.
He has refused trial once before, because even if according to Tolkien he might have felt some repentance, the idea of intentional surrender has been to him for ten millennia the most repugnant of sins.
This is a charade presenting himself as fighting with all his strength, while all actions examined demonstrate a profound draw towards grievous and catastrophic personal harm, bringing down as much of the world the Valar and Ilivatar love as possible with him. If this Numenor thing tears the immortal world into enough chaos, the Valar would surely not deign to offer him trial, and would as per Melkor skip straight to sentencing, to obliteration, something which Sauron would and could not, after the creation of the ring, possibly do for himself.
And this succeeds. Entirely so. As the attack of the Numenoreans on Valinor clearly begins to lead all forces to mass slaughter and the seas rise, Sauron does not flee when the jig is up, but stands atop Melkor's temple, continuing to theatrically throw himself upon the Valar, painting a massive target on his own head. However, it does not work as he was hoping it might. Quite possibly because of the Ring, Iluvatar and the Valar won't, or cannot send him beyond the Door of Night, where he might be with Melkor or even simply be free of a campaign of terror far too long underway to take back. They painfully and humiliatingly refuse to sever his spirit from Arda, and destroy everything he holds within the circles of the world, which he remains still powerless to leave.
It's, if interpreting Iluvatar as a humanoid-enough thinking being, an incredibly idiotic move-- forever removing the last remnant of options for Sauron to decide to quit. He cannot impeccably change forms and live unhunted as a beast or new being. He cannot discorporate and leave the circles of Arda on his own. He has no purpose other than to serve Melkor, and in his absence, becomes Melkor, a wound on the earth continuously bleeding black oil onto everything he touches. And in at least a halfhearted attempt to halt the envelopment of the old world, he instead made it drastically worse.
Well yeah, so. He is a creature of pride and war-manners believing that surrender comes only when you have demonstrated the full extent of your ability-- that choosing surrender was worse than a loss. So he must manufacture one, and instead only dooms himself far more deeply.
