Give him about a week without touching or bothering him to help him settle in to his new enclosure. No food or anything for that week. Then try again inside his enclosure. If his new enclosure is bigger than his last you may need to add more "furniture" to make him feel more secure. Somtimes the move itself is just stressful enough to make them want to skip some meals.

On another note, make sure you have a good quarantine proceedure. Dont handle him or anything in his tank and then go handle your other snake as he could have an illness or parasite that has yet to reveal itself. Use sanatizer on your hands after touching him or anything in his enclosure as well as dont use the same tools for both snakes (if you use any that is, ie feeding tongs or snake hooks). Good luck to you and I hope all turns out well