The answer is NO .
Eh, no! Have you considered what would happen to the balls on the table when the ship rolls and pitches? ;-).
Before anyone says, "Ya what, you're at sea", can I just say that RCI's Radiance Class does have pool and snooker tables which are fascinating to watch when on the high seas so the answer is ....Could be. .... Neil.
I can't remember seeing any. As Neil says, the $250,000 self levelling pool tables on Brilliance are amazing!