Not a dev, but you can click one of your own (or a neutral) territories to let them move there, even if it takes multiple turns getting there.

Basically, you can't roam around in the territory, but everything that moves them out should work.

Shakiko wrote:

Not a dev, but you can click one of your own (or a neutral) territories to let them move there, even if it takes multiple turns getting there.

Basically, you can't roam around in the territory, but everything that moves them out should work.

I tried a save, and that does work, but then the armies dies at sea because I can’t control the necessary safe coastal route.

Agreed this is a huge problem. You can move as the other poster said but it's awful. If one weak unit is in the way of your 6 stack army, you cant move past him. Also, they can freely attack you as you move out...  and you can't do anything about it. I was grinding my teeth one game over it. They need to either 1) teleport armies out after a peace settlement, or 2) Put "withdrawal" buff on units in enemy territory for like 2 turns after peace. Ignores zones of control + 2 movement may not attack or be attacked. 

I've got a Saboteur that's actually stuck, and telling it to move to friendly territory doesn't work. In fact, the movement arrows only show up if I tell it to move to a nearby enemy city (which of course it can't do because the war just ended as in the OP's case.) I haven't reproduced it, nor have I found a workaround. Reloading or restarting doesn't work.  

Addendum: My stuck Saboteur is also not taking attrition damage. So that's nice.