Hi!
There are no sculpting tools like the ones in Cities:Skylines (*), but there are some, albeit a bit more complicated methods that you could use to generate terrain. Check out this post and the links in it for a few pointers: 3D mountain range - #2 by ChocolateLover
*: Cities:Skylines is a game with which I wasted way more time that I’d dare to admit, so it’s a topic close to my heart :))