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As for modifying the files of the game itself, the only things you can change are the visuals and audio. There's only a few of those mods.
Colored Battle Sprites:
https://www.reddit.com/r/Undertale/comments/46ttgr/undertale_colored_sprite_mod_released/
There's a decent number music remix mods. Won't bother linking any, just google.
Not exactly a mod, but HATE allows you to make corruptions of the game.
https://www.reddit.com/r/Undertale/comments/41lb16/hate_the_undertale_corruptor/
If you know what MOGOLOVONIO is there's a mod that changes the Sans fight.
"Mogolovonio: the fight for music."