According to a report in the Aftonbladet daily, a 49-year-old teacher from Sweden in Koh Lanta was riding a motorcycle when she collided with a large truck, dying immediately. She is survived by her three children.
The Swedish priest from the nearby island of Phuket joined the crisis group appointed by the Swedish embassy in Bangkok at the school where the woman worked.
Koh Lanta is a popular island with Swedish and other Scandinavian tourists. The island houses a semi-permanent Swedish population and features several schools offering tuition in Swedish.
Thailand ranks worst in the world for motorbike and moped casualties with more than 11,000 drivers of passengers dying per annum, according to official statistics.
Much of the blame for the high fatality rate is explained by the fact that only 47 percent wear helmets.
The Thai government designated 2010 as the year of the helmet in an attempt to meet UN road safety targets of fewer than 10 deaths per 100,000 people.