Can an Indonesian expatriate in Bangkok apply for a dependent visa for their family?

Yes you can, the dependents can use the OSS center as well

You can apply for a dependent visa (Non-O visa) for your wife and kids here in Bangkok since you’re working under a BOI (Board of Investment) visa. Typically, dependent visas for family members are processed through the same channels as your BOI visa. However, different immigration offices may provide varying information due to specific office procedures or interpretations of the regulations.

Here’s what you can do:

1. BOI Office: Since you are under a BOI visa, it’s often faster and more efficient to handle visa matters directly with the BOI One Stop Service Center. They specialize in processing dependent visas for BOI-sponsored employees, and this could bypass any confusion at different immigration offices.

2. Documents Required:

• Marriage certificate (for your wife).

• Birth certificates (for your children).

• Your BOI work permit and visa.

• Proof of financial means to support your dependents (bank statements, salary slip, etc.).

3. Application Location: Try reaching out to the BOI One Stop Service Center in Chamchuri Square. They may clarify the discrepancies you encountered at Chaengwatthana Immigration.

Yes, a foreigner in Thailand with a valid work permit can sponsor their spouse and children for a non-immigrant visa (typically an "O" visa). This allows them to stay in Thailand for the duration of the work permit holder's stay. The process involves submitting the necessary documents, including proof of relationship, financial stability, and the work permit. It's advisable to check with the Thai immigration office for specific requirements and procedures.