My brother has an Xbox 360 and Xbox Live/Gold.
We've done lots of research but can't find any mods for Xbox 360 Minecraft.
Sadly, there is no possibility to import mods into Minecraft for the Xbox 360.
On top of that, it is also against Microsoft ToS to mod or use mods for games that don't officially support them.
I did some research and could not find any legitimate way to mod the game.