It’s an online game then how can it be modded? You are right,It’s an online game and this game can not be modded in their official servers.This game is modded with private servers.
Screenshot proof :
About Coc Mod Apk :
What's in mod Apk : Unlimited Gold Elixir Gems
Required Android : 4.0 and up
Version : 9.105.9
Size : 82 MB
Simply download Apk from below link, install it and enjoy !!!
Download Link :
Clash of clans mod apk v9.105.9 - Here