The Vietnam Tourism Administration (VNAT) has asked tour operators not to take Vietnamese tourists to casinos overseas.
In an instruction sent last week, it has also asked international tourism agencies in the area to keep Vietnamese visitors away from places that "have signs of insecurity and disorder".
The VNAT has also said city/provincial departments of Culture, Sports and Tourism have to ensure local tourism agencies with international operations strictly follow regulations and provide proper insurance to tourists.
Such agencies should choose overseas partners that have the legal status and the capability to serve tourists and measures to ensure protection of life, assets and interests of tourists.
Illegal tourism agencies or those whose customers are involved in accidents abroad will be punished, VNAT said.
A Vietnamese tourist was killed and nine others injured in Bangkok last month after the Thai driver of their bus fell asleep and lost control. They were participating in a tour co-organized by Neo Duong Viet (Vietnamese Road) Company and Thailand's 333 Company.