The amount of times a floor can be sanded relies on several things, the main one being the thickness of the wood. You would be happy to know that some solid hardwood floors can be sanded down easily with the help of experts. Generally speaking, a strong hardwood floor can be sanded and put in a new finish about 4 to 6 times. Engineered hardwood floors, which have just a little top layer of hardwood veneer, can only normally be sanded 1 to 3 times.