Matinthiran was accused of extorting some five million euros (7.4 million dollars) from France's 75,000-strong Tamil community, many of them refugees from the conflict in their homeland.
The court also ordered that the Coordinating Committee of Tamils-France be dismantled after ruling that it was a front for the LTTE, which is on the European Union's list of terror groups.
The alleged Tamil leader in France and the 20 other defendants appeared in court for the sentencing along with family members and a large contingent from the Tamil community, among the biggest in Europe.
Two more LTTE members were given four years in prison and a third six years, while the others received sentences ranging from three and a half years to six months suspended.
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One defendant was acquitted.
The defendants were convicted