How do you remove pine sap from linoleum?

Acetone (nail polish remover) would probably work.

A good product to have around is Goof Off - it is, I think, oil based and good for removing gum, gunk on shoes, residue from store product stickers, tar and things

like that. I believe a copy cat of it is called "Oops" or can possibly even use the little

can of 3-in-1 oil - these can all be found in your local hardware store !