Really, sand isn't a good substrate for any snake, including a Sand boa. I would try to stay away from the sand if I were you. Sand or soil could definitely at some point cause impaction, and it's a pain to try to get the sand or soil to pass. Burrowing snakes, like Sand boas and Hognose snakes, love to burrow in Aspen Bedding. Just put a few inches of Aspen Bedding in and your boa will love it. Aspen keeps the tunnels they have made and is great for spot cleaning.