Saiful Muhtorir was found guilty of helping funnel cash to the militants behind the assault, which killed eight people.
At the courtroom, he accepted the judge’s verdict, saying he will not file an appeal.
Muhtorir, also known as Abu Gar, was also indicted for weapons possession. Prosecutors had been seeking a ten-year sentence for his crimes.
Earlier, three others were jailed for their roles in a series of attacks, with dozens of others arrested over suspected involvement.
The attacks took place in Jakarta on January 14, including seven continuous attacks at the Sarinah shopping complex and another near a Starbucks outlet opposite the shopping centre, killing at least eight people and injuring 20 others.
It was the first major attack for seven years in Indonesia and was claimed by the Islamic State group.