Yes, a foreigner can get Thai citizenship, but the process can be difficult and time-consuming. Here are some steps you can take to apply for Thai citizenship:

- Meet the eligibility requirements: To be eligible for Thai citizenship, you must have resided in Thailand for at least five consecutive years, have a clean criminal record, and pass a Thai language test.
- Gather required documents: Gather the required documents such as your passport, proof of residence, marriage certificate, police clearance and a proof of income.
- Submit the application: Submit the application for Thai citizenship to the Department of Provincial Administration. It’s recommended to have a lawyer to assist you with the application process.
- Wait for the decision: The process can take up to several months and the decision is based on the discretion of the government.
- Take the oath of allegiance: If your application is approved, you will be required to take an oath of allegiance to the King and the country.
- Renounce your previous citizenship: If you are granted Thai citizenship, you will be required to renounce your previous citizenship and obtain a new Thai passport.
It’s important to keep in mind that the process of obtaining Thai citizenship can be difficult, time-consuming and the decision is based on the discretion of the government. Also, it’s important to be aware that the process and the requirements can change over time. It’s always best to consult with a lawyer or an immigration expert to ensure that you have the most up-to-date information