I asked: does this apply to other modals? t.ex. Var har han gått? Han har hem.
måste + place can mean 'has to go to somewhere'. There is a handful of verbs, all of them modal verbs, that can behave this way – ska or vill are the ones I can think of right now. Jag vill hem means 'I want to go home' Jag ska hem means 'I am going home, I am headed home'.
ha and most other verbs don't behave this way.
You can say it, but it would mean 'He has homes' :)
I just wanted to clarify that ha isn't a modal verb, but since only modal verbs behave this way, it's true that this means you can't use har in this sense. On the other hand not all modal verbs can be used like that either.