Never heard of sand. Maybe because there's not much of it in SW Ohio. We put rubber roofing on the floor of their coop and put in a thick layer of straw. They love it. Just throw some scratch down and they'll dig for it. The straw will be broken up and matted down in a few weeks. If you sprinkle scratch at night after they roost, they will "make their beds" in the morning (cover the poop from last night.) Just keep putting a new layer of straw on. It's the deep litter method and it has worked very well for us. I clean out the wet or gross spots about every three months and the whole coop 2X a year.