There is a product you can buy called "scat mats" or "x-mat"

http://www.drsfostersmith.com/Produc...01&N=2002+2017

More training products:
http://www.drsfostersmith.com/produc...fm?N=2002+2017

It's basically a little plastic sheet with raised bumps on it and when the cat jumps and lands on it they DO NOT like the feeling on their little paws so it makes it an undesireable place to be!

I have not personally used these products so I can't say how well they do or do not work from a personal perspective but they look promising!