The incident happened in the seas off Kalutara district, about 40 kilometres south of capital Colombo, police said.
The boat was part of a religious festival procession from the fishing town of Beruwala to a site close by. The tragedy happened when the boat was returning from the pilgrimage.
At least 11 people were killed and 19 others have been admitted to a hospital after being rescued, police added.
A search is on for other survivors with the help of navy and air force, reports said.
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