Board Thread:General Discussion/@comment-9309539-20130509062623/@comment-9141959-20130509070006

I'm honestly not sure if it is possible, because I don't have Terraria for the 360, but if it was, I'd assume it's along the lines of simply transferring the world save file you want to import onto your 360 onto an external storage device, such as a USB, then transferring that file to wherever your world save files are.

Hope this helped somewhat.