Samantha Kumara Vithanage was arrested in Pakistan earlier this month and taken back to Sri Lanka, police spokesman Ajith Kumara said.
He told detectives he had imported about 1,000 kilogramme of heroin worth a total of USD 75 million since 2012 to Colombo, a key hub for the narcotic originating in Afghanistan and Pakistan.
Kumara said investigations showed he had links to lawmaker Duminda Silva, who was attached to the defence ministry under former president Mahinda Rajapakse.
"We secured a court order today to check all banks and financial institutions to track down his money."
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Silva was a key financier of the former governing coalition under Rajapaske.
Rohana said the Central Bank of Sri Lanka had been asked to track down any foreign assets of Silva's in Pakistan and Dubai.
Silva, who could not be contacted for comment, cannot leave the country because his passport has already been impounded in connection with an unrelated murder case, Rohana said.