Does anyone know where this four-faced Buddha is in Thailand?

You can ask the people in the travel agency. There are two four-faced buddhas in Thailand. One is in front of Ailvwan Hotel in the center of Bangkok, Thailand (Siam Center, if BTS, get off at chit lom Station, and walk in the direction of centralworld 100 meters, to the left, diagonally opposite the intersection where Central World is located. The other is in the Jade Buddha Temple.

The most exquisite one is the one in front of Lovers Bay Hotel in downtown Bangkok. I don't know if it's what you said. But most travel agencies take you to the Jade Buddha Temple to worship the four-faced Buddha.