This is not very common but there has been a slow up-tick over the years with evangelists arriving in Thailand to preach. What is needed is a Thai Business Visa however the documents for this would be different to a normal business visa. The following documents are required for the visa.
Note that once you have this visa you can now apply for a work permit in Thailand. The documents needed are as follows:
- Application for visa. (TM.87)
- Copy of passport;
- 4 X 6 cm. Photograph;
- Application fee;
- Letter from Office of National Buddhism office of Thailand or Department of religious Affairs requesting for Visa or Visa Status Alteration.
- The Certificated letter from the abbot certify permanent resident of the applicant.
Note that the Department of Religious Affairs falls under the Thai Department of Culture. Much like a Journalist working in Thailand you need to obtain a letter from a government department first. The contact details for the Department of Cultural Affairs is as follows:
Ministry of Culture, Thailand