Habarana Police nabbed the main heroin supplier, who distributed the narcotic in Polonnaruwa, Habarana, Sigiriya, Dambulla and surrounding areas, on Saturday.
The police also recovered three grams and 600 mg from his possession.
The suspect a resident of Kelaniya was known as Kelaniya Kalu Palame Sagara, police said.
The suspect revealed to the police that among his customers were schoolchildren, students attending private tuition classes and youth and he had large number street peddlers.
The suspect told police that he had received money via mobile phones and thereafter delivered the contraband to his customers.
Habarana Police are conducting further investigations under the instructions of Polonnaruwa SSP Laksiri Wijesena.