Sand or aspen is fine.
I have kept Kenyans, rough scales, saharans, javelins and tartars on both substrates. The only difference is weight. I used seived bird sand, but play sand is also quite safe to use. You could also mix in some dry eco earth, as most sand boa's don't actually live in sand.
I also fed all of mine in their vivs. Just make sure that the fur is completely dry.
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