Welcome to Aquarium Advice!
I don't have a salt tank, but I have a FW
tank on a hardwood floor. (well, of course it's on a stand
) I buy one of those plastic dropcloth sheets at Home Depot and cover the floor around the tank as I do a water change. When I'm done, I pick up the edge of the plastic a little so that any water (just some very small puddles) runs to the other edge of the plastic where I can wipe it up with one of my fish-only towels. I give the plastic a quick dry, and then roll the plastic back up for next time.