MPI compliance investigations manager Gary Orr said this sort of offending was very serious.
"You can't underestimate the risk posed by bringing prohibited food stuffs into New Zealand," Orr said.
"We're a nation that relies heavily, in an economic sense, on our primary industries, so the introduction of any invasive pests and diseases through the importation of risk goods makes us particularly vulnerable.
"Pork is prohibited from entry into New Zealand and is considered especially risky due to the prevalence of foot-and-mouth disease in Thailand," he said.
"Biosecurity breaches have huge impacts on the country as a whole and have the potential to have a serious impact on our international reputation as well."
Two Thai vineyard workers have both been fined $1,900 and ordered to pay court costs of $130