Police used an undercover informant to place bets at the Ned Kelly Bar at Valentine's Guest House in Pattaya on May 10, the Pattaya Mail reported.
The bets were made on Australian horse races broadcast over the internet onto large-screen televisions.
Police raided the bar this month and arrested New Zealander Philip Smith, 59, who is allegedly the operator, and six Australians.
Smith told police he had been accepting bets and paying according to the website rate, while receiving a commission, for a long time.
The bar's Thai owner escaped.
The majority of gambling is illegal in Thailand.
The arrests come eight months after police and officials arrested 12 Australians and four Britons on charges of betting on Australian horse races.
The Thai military took control of the government in a coup on Thursday following the imposition of martial law across the country earlier in the week.
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