Sfeir, who wielded considerable political influence during the country's civil war and was an ardent advocate of a Syrian troop withdrawal, was buried in the seat of the Maronite church in the northern town of Bkirki.
Sfeir was a "free and courageous man" who sought reconciliation and sovereignty for his country, Sandri told mourners.
The former patriarch died on Sunday, two weeks after he was hospitalised with a chest infection.
"Sfeir's death is a loss to the nation," said the incumbent Patriarch Beshara Rai. "He is the patriarch of national reconciliation," he added.
His backing of the 1989 Taif agreement, which brought the 15-year civil war to an end, bolstered Christian support for the accord.
Sfeir also spearheaded the opposition to Syria's three decades of military and political domination over Lebanon.
His outspokenness helped swell the anti-Syria movement in 2000.
It eventually led to the withdrawal of thousands of Syrian troops from the country five years later, following the assassination of former prime minister Rafik Hariri, whose murder the opposition blamed on Damascus.
During his tenure, Sfeir also played a key role within Lebanon's fractious political scene, often adopting stances that earned him stiff rebukes from some of the country's rival factions, such as Hezbollah and its Christian allies.
After he stepped down in 2011, Sfeir's opinion and advice continued to be sought by politicians of all stripes, not only Christians, until his death.
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