Land Acquisition
land office documents
3. In case an alien spouse lives in oversea and could not lodge the application of testimony form according to No.1 and No.2. An alien has to contacts the embassy, consular or notary public for giving testimony of an alien spouse in certify letter according to the forms which were specified by the Department of Lands that the spending on land is sin suan tau or personal asset of a Thai not sin som ros or common property one. The embassy, consular or notary public has to certify that person, who applies for certify letter, is truly spouse or they live together as husband and wife with a Thai. After, a Thai who would like to purchase land shall bring original of certify letter to the competent officer for registration of rights and juristic act accordingly.
出典（http://www.thailandlawonline.com/article-older-archive/land-purchase-thai-married-to-foreign-national）