How can you handle a power of attorney when residing in Thailand while the attorney is in another country?

That's not very descriptive. Is the poa for something in another country or Thailand for example. Nobody can correctly answer an incompletly phrased question. I've been using poa, trustees etc for a long time, not that I know everything about every situation.

Your power of attorney document must be recognized in the country where the person acting on your behalf is. For example, I’m in Thailand but the person I want to designate as my power of attorney is in the US. My power of attorney document that I sign needs to be notarized at the US embassy (Bangkok) or consulate (Chiang Mai) to be recognized in the US. Thai notaries are not recognized in the US.

If you’re not dealing with the US then you need to find out what your specific country requirements.

MAKE SURE YOU CAN TRUST THE PERSON COMPLETELY...

I believe you can do it online. I have .y poa in fla