Kulasekara, 34, was returning to Colombo from Kandy on Monday when the motorcyclist, travelling in the opposite direction, lost control of his bike while trying to overtake a bus and got flung into the cricketer's path.
"Kulasekara is currently enlarged on bail by the Kadawatha Chief Magistrate pending completion of the investigation," Sri Lanka cricket said in a statement.
The right-arm medium pace bowler played 21 tests but retired from the longest format in June to focus on limited overs cricket.
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(Writing by Sudipto Ganguly in Mumbai; editing by Greg Stutchbury)
