A source with knowledge of the case told AFP that the 76-year-old was found guilty of two charges related to illegal importation and ownership of walkie-talkies and one for breach of coronavirus rules.
The accusations of walkie-talkie stem from when soldiers raided her house on the day of the coup and allegedly discovered the smuggled goods.
Monday’s verdict adds to the sentences the court sentenced in December when she was jailed for four years for inciting and violating the COVID-19 rules during campaign.
Junta chief Min Aung Hlaing cut the sentence to two years and said she could serve her time under house arrest in the capital Naypyidaw.
The December ruling sparked international condemnation, and the Myanmar public returned to old protest tactics by pounding pots and pans in an expression of anger.
Prior to the verdict, Manny Maung, a Human Rights Watch researcher, said further verdicts would deepen nationwide discontent.
“The announcement of her latest verdict resulted in one of the highest days of social media interactions inside Myanmar and made the public deeply angry,” she told AFP.
“The military calculates this (the cases) as a fear tactic, but it only serves to divert more anger from the public.”
Journalists have been barred from attending hearings, and Suu Kyi’s lawyers have been silenced for speaking to the media.
Under a former junta regime, Suu Kyi spent long periods under house arrest in her family palace in Yangon, Myanmar’s largest city
Today, she is confined to an unknown place in the capital, with her connection to the outside world limited to brief pre-court hearings with her lawyers.
In addition to Monday’s cases, she is also facing several cases of corruption – each of which can be punished with 15 years in prison – and for violating the law on official secrets.
In November, she and 15 other officials, including Myanmar President Win Myint, were also charged with alleged electoral fraud during the 2020 election.
Her National League for Democracy party had swept the polls in a landslide, destroying a militarily affiliated party by a larger margin than the previous election in 2015.
Since the coup, many of her political allies have been arrested, with one prime minister sentenced to 75 years in prison while others are in hiding.