Turn the sofa over, letting the back rest flat on the floor. Clean the legs of your sofa, getting rid of any dirt, grime or residue buildup. Leave the sofa on its back, and allow the legs to dry for at least an hour.
Sand the bottoms of the sofa legs. Only sand the area that touches the ground when the sofa is sitting upright, as sanding the sides of the legs will ruin your sofa's look. For best results, use 120-grit sandpaper. Use a dry cloth to remove any leftover shavings.
Place a piece of construction paper on the bottom of the sofa leg and trace the area of the leg with a pencil to get its correct measurements. Repeat the procedure for each leg if they're different sizes, then cut the patterns out with scissors. These will serve as templates for your slip-resistant furniture pads.
Use each template to cut out the correct amount of slip-resistant material. There are many things that you can use, such as rubber-grip cabinet liner or felt pads. Rubber furniture feet may already be the correct size, so they may not require cutting.
Secure the slip-resistant pads onto the bottom of the sofa's legs. Some felt pads and rubber furniture feet are self-adhesive, but double-sided tape works well, too.