If you are visiting Thailand on a tourist visa (30 days) and wish to extend your visit, you can extend your tourist visa an additional 30 days at any immigration office within Thailand for a fee.
If you want to visit Thailand beyond the 60 days, you must leave the country and apply at any Thai consulate or embassy. The nearest Thai consulate to Sakon Nakhon is in Savannakhet, Laos.
Step by step Procedures: Visa Run Savannakhet, Laos – Pinoy the Explorer date posted 6 August, 2016
The above article was written for ASEAN nationals. Non ASEAN nationals are required to apply for a visa on arrival when entering Laos
Saturday, May 6, 2017