Why does’t it work? Hm. Start from the beginning.
Step one, download Minetest OS X version.
Step two, drop Minetest.app into Applications folder.
Step three, modify permissions because El Capitan requires that now.
Step four, run Minetest.app then run it again to create initial folders.
Step five, reset permissions back and open "~/Library/Application Support/minetest/"
Nothing in there but the word Separator. Okay. Moving on.
Step six, create a new Minetest world. The worlds and cache folders pop up.
Step seven, close down and create the mods folder in the minetest folder.
Step eight,
download a simple mac made mod, and drop its unzipped folder in the mods folder.
Step nine, run Minetest.app again, select the world, and click the configure button.
Step ten, select the word identify, check the enable box, click the save box, then click the play box.
Did work? Well, it’s a bit buggy. But yeah, it worked. YMMV!
P.S. Tried it with a real mod
CME. It took a few minutes but everything showed up.