The country's immigration police ordered a thorough check on the travelling document of Mirabel Misori when she presented her passport at an immigration counter at Suvarnabhumi international airport.
The police suspected she was using a fake visa and their suspicion turned out to be true after using a detector to verify it.
Ms Misori, 26, said she had paid US$800 to a man in Cameroon for a fake visa to enter the country as a tourist with a plan to find a job in Thailand, Pol Col Paritthipong Prayoonsiri, the deputy superintendent of the immigration office at Suvarnabhumi, said.
Information on the fake visa showed it was issued by the Thai embassy in Cameroon. The Cameroonian came to Thailand on Kenya Airways flight KQ886 from Nairobi, Kenya.
She was handed over to the Suvarnabhumi Airport police station for legal action.