Sigit Indrajid confessed at an earlier hearing to leading a group which planned to attack the mission in Jakarta to avenge the killing of minority Rohingya Muslims in mainly Buddhist Myanmar.
The plight of the Rohingya, many of whom have been killed or displaced in sectarian unrest in Myanmar, has caused widespread anger in Muslim-majority Indonesia.
The plan was foiled last May 2 when police caught two of the plotters riding a motorbike in the capital, and one of them was found to be carrying a backpack full of pipe-bombs.
Presiding judge Hariono told the South Jakarta District Court that Indrajid, 23, had been "proven guilty, legally and convincingly, of committing an evil conspiracy by carrying out an act of terrorism".
He handed him a seven-and-a-half year sentence.
"The defendant's actions contravene government efforts to combat terrorism and they spread public anxiety," said Hariono, who goes by one name.
"The defendant realised the bombing would create fear among people and damage public facilities," he said.
Indrajid showed no remorse during the hearing and smiled during much of it.
After he was sentenced, he told AFP: "I will continue fighting the enemies of Islam."
"It is not a death sentence," he said. "We need to fight for the implementation of Islamic sharia law here.
"The plotters were part of a network called Negara Islam Indonesia (The Islamic State of Indonesia), and Indrajid is the third person to be jailed over the embassy bomb plan.
The court previously heard how he met some of his accomplices on Facebook, where he posted messages about the need to avenge the killing of the Rohingya.
The Rohingya issue has sparked several protests by hardline Muslim groups in Indonesia, including one outside the Myanmar embassy on the day the attack was planned.
Indonesia was rocked by several deadly terror attacks in the last decade, including the 2002 bombings on the resort island of Bali that killed 202 people, mostly foreigners.
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