I switched from shavings to sand about a year and a half ago and I just hate it. I read how wonderful it was and thought I would give it a try. Our coop is 10' by 6' and I have to get on my hands and knees and clean it out each week. It is like a giant litter box and I have poop boards, (which I also hate, but that is another story) but they still manage to poop all over the floor as well. In corners, behind their feeder, anywhere it is difficult to get to, there by forcing me onto my hands and knees with a kitty litter scooper. Then they kick out the shavings from their nest boxes into the sand as well as throw their sunflower seeds and oyster shell all over it. It is always a mess.
I don't want to be cleaning my coop every single day of my life, so I will never have sand again. It is also very cold in the winter and when water got spilled in there during a cold spell, it was a horrible mess with wet sand everywhere, which had to be removed. Oh, and did I mention the dust? Since we installed the sand, our coop is at least twice, maybe even 3 times as dusty as it ever was with the pine shavings. I don't know why, but it is horrible. I have to take the shop vac to the coop every couple of weeks. I have a fan in there for them and if I just turn it on without running the shop vac first, it is like a dust storm. Can't be good for their breathing.
We are building a new coop soon and I will go back to pine shavings and never look back again. I used pine shavings with no problems for 11 years. I will never know why I messed with a winning system in the first place. Really think long and hard before you use sand in the coop. In my experience, sand is extremely high maintenance. It might be ok in the run, I never used it there as our run is pretty large. But I will never put it in a coop ever again. Of course, this is just my opinion and findings, your mileage may vary. HTH