Aichi police estimate that scams allegedly carried out by the group caused losses of around 1.4 billion yen.
They also said Sasaki provided funds used to finance the operation.
The arrest is linked to a case from February last year, when Sasaki was suspected of working with other Japanese perpetrators to make calls from Cambodia to a woman in her 30s in Tsukuba, Ibaraki Prefecture, eastern Japan.
Police allege the woman was defrauded of 31.4 million yen in cash after being falsely told that her bank account had been used for money laundering and that the funds in the account needed to be investigated.
