https://travel.state.gov/content/travel/en/us-visas/Visa-Reciprocity-and-Civil-Documents-by-Country/Thailand.html
Police Records
Available
Fees: 100 Baht; must be paid in Thai currency.
Document Name: “Nang Sue Rab Rong Khwam Praprued”
Issuing Authority: Royal Thai Police
Special Seal(s) / Color / Format: Garuda
Issuing Authority Personnel Title: Police Clearance Service Center, Building 24, Royal Thai Police Headquarters, Rama I Road, Patumwan, Bangkok 10330, Thailand; Tel: 66-2205-2168-9; Fax: 66-2205-1295; E-mail: pcscenter@royalthaipolice.go.th, pcsc.thaipolice@gmail.com
Registration Criteria: There are no registration criteria.
Procedure for Obtaining: Residents of Thailand requesting a Thai police certificate need to present two recent photographs (2” x 2”), the original and a copy of his/her passport, identification card, household registration, name change certificates (if any), marriage and divorce certificates (if any). Thai males aged 17-45 must also present military record or proof of exemption from military service. Non-residents should send their requests to the Royal Thai Police Department at the above address with the required documents and a fingerprint taken by a police authority at their place of residence. Normal processing time is approximately 30 business days.
Certified Copies Available: One certified copy (must be requested at the time of application)
Alternate Documents: There are no alternate documents.
Exceptions: None
Comments: The certificate application will not be processed until all required documents and certificate fee are provided: pcscenter.sb (link broken), but the following PDF should have all the info you need https://th.usembassy.gov/wp-content/uploads/sites/90/Instructions-for-obtaining-Thai-Police-Certificate-2021-eng.pdf
A police report from the Philippines will also need to be obtained.