Is there a way to fix springs pushing up on a couch cushion?

My friends from church put a piece of plywood over their springs (they were not in the cushions so I hope this helps). Then the cushions supported their weight without the springs pushing up in them. I hope this is what you meant.

I have put a thin board on the bottom or a folded blanket and you don’t feel them

In the couches I have restored the the paste, the springs are usually tied down with a strong cord to hold them in place. So I can only assume the string that holds them in place has broken. If you have removable cushions you may be able to remove the lining and expose the springs and tie them back down again.