Pyongyang last month declared invalid the 1953 non-aggression treaty, cut two military hotlines, and announced at the weekend that it considered itself in a state of war with the South.
However, he said the situation in South Korea is currently considered normal and war has not been declared, he said.
Jakkrit said his ministry has already held a meeting with representatives of both the public and privates sector to prepare for what can be done should the situation become tense.
At present, there are about 44,000 Thais in South Korea, Most of them are in the capital Seoul, and surrounding areas, far from the border. They are skilled workers, students, company employees and women married to South Koreans.
The Thais there have a communication network through which they could share and follow up information.