Time to train the cat.
We had a cat that would NOT stay off the kitchen countertops, but we cured him of that in a very humane manner...
Local gun shows typically have a blow gun vendor. Besides the normal 'darts' they sell with them, they also sell a Nerf-like projectile called a 'thumper'. It is foam, and will not harm the cat, or anything else for that matter. Everytime the cat gets near or up on the table, shoot a thumper at it. It will startle it, and pretty soon the cat will get the message.
The pet stores used to sell a spray that I used many years ago to keep the cats out of the nursery. You simply sprayed it across the threshold of the room, and it worked...cats never crossed that invisible line. I guess it smells bad to the kitties. Something like that sprayed around the perimeter of the table would do the trick.
Go to your local Petco or Petsmart and talk to the 'experts' and see what they suggest.
Lisa