Hi, I want to know can a tourist with a new fully paid car get a mortgage loan with bank .thks

Since having 'a new fully paid car' would infer that one bought a car outright with cash payment, like most mature loan markets worldwide, this would have no influence on whether the same person is a good credit risk for a home loan. Home financing is different in that a persons pre-existing assets will also be a factor in deciding credit worthiness but banks still look at a persons credit history as well. Buying a car outright with cash will not appear on said credit history and unless it is a Bugatti Veyron or a collectible, the price paid for a car is much less than the price of a home so an insignificant asset.

But this is Thailand, go ahead and try.