The controversial cleric Ashin Wirathu addressed a convention, organised by the hardline Bodu Bala Sena (BBS) or Forces of Buddhist Power, attended by about 5,000 monks at a packed stadium in Colombo.
"The patience of Buddhists is seen as a weakness. Buddhist temples have been destroyed. There is a jihadist threat against Buddhist monks," said Wirathu.
"Media organisations along with world powers are using technology to carry out a campaign against Buddhists," the cleric said.
The 969 movement is a nationalist movement opposed to what they see as Islam's expansion in predominantly-Buddhist Myanmar.
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Wirathu said he was thankful to President Mahinda Rajapaksa for allowing him to enter the country, despite pressure from the Muslim extremists.
BBS president Kirama Wimalajothi, a leading Buddhist monk, said that Sri Lanka is a country for the Sinhalese-Buddhists and not a multi-religious country.