That's a really good question. I know you can't just schlep ball pythons back and forth overseas...you need specific (and not cheap) paperwork filled out to export and import them. But I have no idea about corn snake regulations. I would suggest finding a breeder in the country you are in that exports animals and see if they have any suggestions. I doubt they actually export corn snakes to the States...but they might at least know what's involved, or where to look to find out.
Your best bet will most likely be to find that snake a good home in its current country, then buy yourself a new one when you get back to the states. But maybe there is another solution. Good luck.