Who really knows?
I suppose it would depend on his degree of incarnation. Balrogs could be killed because they were very tied to their physical forms, but other Ainu went unclad, and their forms were merely raiment they wore in order to be seen in the physical world. They were not fully incarnate, so if you killed their physical form, it would just be like stripping off their clothing (it wouldn't hurt them).
So we can't say for sure if Sauron could come back, because it would depend on how often and deeply Sauron interacted with the physical world. It's possible he would've been careful not to become fully incarnate if he didn't have the ring to fall back on.
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