I tried sand in the coop and it worked fine with my Rhode Island Reds, but now I have some bantam feather footed and vulture hocked chickens and they seem to drag their feathers in the poop that sits on top. The Rhodies used to dig it up a lot more and I never had poops all over with them. The poops were buried and I sifted them out like a giant cat litter box.
I also realized when they sometimes spill the water that it stays cold and damp a long time, and that will be no good for winter here to have their beding frozen solid, so I dumped all the sand into the run area and changed the coop up with "Boxo" which is like Carefresh, a paper bedding that is light and fluffy. (Boxo is cheaper than Carefresh). I used to use pine shavings, but the dust was hurting my lungs.