Undertale is a 2015 two-dimensional RPG game from the United States produced by independent developer Toby Fox. The player controls a child who has fallen into the Underground: a vast, secluded region beneath the Earth's surface, separated by a magical barrier.
But this one is Undertale in Minecraft.
Yes, Undertale Add-on and here are some previews of the Undertale Add-on.
In this addon not only sans, there are other characters in this Undertale Add-on too, so have fun!
Note: This add-on is still in Beta, so there are still a lot of bugs in this addon, and don't forget to turn on all experimental.
Special thanks to KMN THE GAMER & DREV Helped me in making this add-on.