I was talking to a local sand boa breeder at the last repticon and he almost talked me into getting a pair but I wanted to look them up online first.
He had said that sand is fine, but feed in an external tub. I think Robin picked up one or two sand boas from him.
On the same token, reading online, it definitely sounds like it's not require and you should probably stick to another type of burrowing substrate. I'm in now way trying to discredit what was said, just letting you know what I heard.
If I had gotten one, I'd put it on Aspen like the others.
I have 2 sand boas right now and I keep them on a mixture of calci-sand and coco-bark, I have had no problems with it and after doing the research, I decided to go with this mixture. I do feed them in seperate containers as I do all my snakes. i was just asking as my niece has this stuff as a play toy and it seems pretty cool. Not planning on using it just asking