this may sound kinda dumb, but bear with me...

in a snake husbandry book by bartlett they mentioned that when they've had problems feeding sand boas they introduce crickets. they say that a cricket accidentally got into one of the enclosures of a kenyan sand boa that hadn't eaten yet and it ate it... ever since then they've fed crickets to the non-feeders and after a few feedings they take a cricket scented pinky. the book said they preferred that to a pinky pump for this species because the neonates are so small.