A multi-religious group led by Buddhist monks said the country had failed to grasp the threat posed by hate speech and attacks because local media reports had not been "impartial or factual".
"There is at present a public perception that such attacks are taking place due to failure of law enforcement authorities to take necessary action," said the Forum for Inter-Faith Dialogue (FIFD).
"If unchecked, these alarming trends would cause immeasurable damage and drawback to the country.
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FIFD, which is backed by the highest levels of Buddhist, Hindu, Christian and Muslim clergy and is an initiative of former president Chandrika Kumaratunga, said it was asking for full implementation of the law.
The call came after a string of attacks against churches and mosques, some of them led by young Buddhist monks.
Videos shared on YouTube have shown Buddhist monks throwing stones and smashing a Christian prayer centre in southern Sri Lanka earlier this month while police looked on.
Monks