When I got my sand boa, he gave me some problems with feeding. From all my research, I understand they have very low metabolisms, especially males. I have even read of sand boas going off food for 4 mos. or even in one case 8 mos., but now that spring is approaching he should be getting hungry more readily.
Mine didn't eat for 2 mos. when I first got him. He's a Saharan. He had only been fed live mice. He didn't eat for 2 months and had 2 shed cycles. The girl who had been taking care of him, I think was trying to feed him mice that were too large, and described him as a difficult snake. Personally, I think sand boas weren't her specialty. Every week, I'd offer and still no response. Finally, I decided to strike out on my own and got a mouse that was quite small, about the girth of his body(much smaller than the ones I had offered in the past). Maybe you should try a smaller meal. I am not sure what size you are trying to feed him and not sure what your husbrandry is. Also, are feeding in the cage or outside? I prefer inside, and I think they like the security of being hidden before the attack.
Mine is also very shy and doesn't like me to watch, so I just leave the mouse in for a while at night and check on him periodically to ensure his safety.
His second meal is coming up on saturday(2 weeks later) and I hope he eats, but I wouldn't worry too much if he doesn't take it. They are so hardy. I hope this helps and confirms any concerns. Btw, it's soooo nice there are other sand boa ppl out there. We seem to be less active than the other forums.