Juhanda, who like many Indonesians goes only by one name, was found guilty of an act of terrorism that killed a toddler and hurt three other small children on Borneo island last November.
"The defendant has been proven guilty of committing a terrorism act," Judge Surung Simanjuntak, from the East Jakarta Court, said.
Prosecutors said Juhanda travelled to the Protestant church in the city of Samarinda by motorbike, intending to carry out the attack.
Two-year-old Intan Olivia Marbun was killed in the blast.
Juhanda was arrested along with four others, with all five accused of belonging to the Jamaah Ansharut Daulah group (JAD), a local militant outfit that supports IS.
One of his co-conspirators, Joko Sugito, was jailed on Monday for seven years for his part in the attack.
The three other defendants involved in the case have received sentences ranging from six years to six years and eight months in prison.
In 2002, a bomb in Bali exploded killing 202 people and, more recently, a suicide bombing and gun attack claimed by IS in the capital Jakarta killed eight people in January 2016.
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