Rajitha Senaratne, a spokesman for the new government, said investigators had traced USD 1.06 billion to the National Bank of Dubai, although he did not reveal who held the accounts.
Former president Mahinda Rajapakse and his immediate family are accused of siphoning large sums of money from the public coffers during his decade in power, which ended when he lost January elections.
He said the government had learned that up $10 billion in public funds had been been stolen and taken out of the country.
Sri Lanka's anti-graft body has already slapped overseas travel bans on the former central bank governor Nivard Cabraal and Sajin Vass Gunawardena, a key Rajapakse aide, pending a corruption investigation.
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The new government has set up a special police unit to investigate large-scale financial fraud.
Rajapakse and his relatives controlled nearly 70 per cent of the national budget during the former president's rule.