Thailand must consider two vital elements, namely its internal legal system and environment before signing the Hague Convention on Choice of Court Agreements 2005 (Hague Convention). This paper investigates whether the law of Thailand in its current form is inconsistent with the Hague Convention. Articles 1–15 are examined to identify areas of inconsistency and to suggest appropriate solutions. This study finds that the internal legal system of Thailand is not quite in line with the Hague Convention. This conclusion leads to analytical recommendations to suit the needs of the current Thai legal system. Implementing these recommendations is necessary for Thailand if it intends to become a Party to the Hague Convention. Thailand must not only have a specific implementation act but must also review and revise the relevant laws appropriately.