I've seen plenty of SATA board to IDE device changers but never the other way around.
If you've only just bought the drive take it back and exchange for an IDE one - less cabling and mess inside your case too.
Actually, I've seen the sata to IDE, IDE to SATA two way adapter. It's not a good idea to use this kind of thing though. I agree about exchanging the drive for the sake of less mess inside the case.