Is it possible to move painted terrain?

So I’ve painted some terrain and when I go to test it out, I realize some mountains are too close together. Is there a way to simply move them instead of having to try to smooth out where they were and repaint them somewhere else?

Your best chance in doing this is to export the heightmap from the terrain, import it in to photoshop, make some adjustments, and reimport the heightmap. After a quick search (and brief glance at the video) it looks like this guy walks you through the process.