Yep it has the meaning "Dont do that" Example : 철수야! 지금 밖에 나가면 안돼 Dont go out now / You cant go out now (maybe because the speaker still has something to do with 철수(Cheolsu), or the wheather outside is bad, or maybe it is that Cheolsu isnt allowed to go outside, could be anything depending on the context)