Donavanik has called on the business community to help restore international confidence in the destination.
"I am confident that we will recover within the next six months as long as the international perception is re-engineered and the world community once again has faith in our political system," he said. "The most important thing is that all parties, including the private sector and government, must work together to restore confidence in Thailand."
Thailand's natural landscapes, people, service and cuisine had helped the destination recover quickly from political unrest in the past, he added.
Thai hotel group Dusit is continuing its international expansion with properties planned for the Middle East, India and China.
It also plans new hotels in the Thai destinations including Samui and Phang Nga, which it says is a mark of confidence in Thailand's tourism.