Can I drive my Thai registered car through Laos, Vietnam, Cambodia, and Myanmar?

You need specific insurance. I think you can buy when you cross the border though.

Myanmar with guide only. Vietnam does not allow independently driven foreign vehicles in.

When all (borders u mentioned) land borders open u most defenetly can (with all relavant documents)p. s. Myanmar will still take some time to open though.

Contact the embassy of each country. You'll need transit carnets for each country, international driver's license, and insurance. What they do not want you to do is sell the car in their country, so they are pretty strict about entry and exit. Myanmar will be difficult, as you'll need a government guide with you driving at all times, and where you can drive is very restricted, but for the right fees you can get permits. Myanmar Travel and Tours is the government agency that can arrange all that. The whole trip can be done, but it is a very lengthy process to get all the permits. I have friends that have done it on motorcycles, but not cars. It should be all the same though. Right now crossing the borders is the hard part.

You can take a car to laos if it is registered to you but have to get a passport fir it at the vehicle registration office you get pass for windscreen and 2 stickers for body of the car cost a couple oh hundred baht but thants when boarders are open

Cambodia you can drive within the district bordering thailand.

The cambodian authorities will give you a paper when you cross the border

I believe your question is irrelevant, since the land borders are closed.

As far as I know Myanmar is out of the question.

I wanted to do this but, it’s not easy to do. Ended up driving to border and hiring a car on the other side

With the proper paperwork but land boarders are closed

I would also be checking if the vehicles insurance cover is valid, outside of the country..

Old days yes with lots of arrangements, now i would forget it. There is a land border opening up to Loas on December 24th.

No idea about borders between other countries