The Honda DN-01 is officially not available in Thailand, but I'm sure that you can contact RedBaron in Bangkok or another trusty motorcycle shop who is willing to import a Honda DN-01 for you.
The most important thing is that you search and re-search the motorcycle shop's history before you do business with them, many people who ask a less trustworthy motorcycle shop to import a motorcycle end up with getting the motorcycle as promised but without the needed papers to registered it legally for Thai road use.