Falk, 53, was convicted on the basis of chat messages on the platform Sky ECC, which European police hacked in 2021.
"The content of the messages shows that the man took an active part in the planning and implementation of all four charges and that the activities were organised to conduct large-scale drug trafficking," the judge in the case, Göran Lundahl, said in a press release.
The crime was carried out between 2020 and 2021 between Spain, Colombia, and Costa Rica and in international waters.
Falk was arrested in August 2024 in Spain and extradited to Sweden the same year, where he was found guilty last year for involvement in a blackmail operation targeting the banker Joachim Kuylenstierna.
Falk is sometimes known as 'the Playa Swede' due to the luxury lifestyle he had lived in Sitges, south of Barcelona, and his involvement in the so-called 'Playa case'.
He sprung to notoriety in the early 1990s when, under his previous name Johan Oredsson, he carried out a string of robberies targeting banks and post offices in Skåne and Småland, and Södermanland, escaping overseas and living a life of luxury in Thailand and Miami before being arrested.
He was arrested again in 2010 in the so-called Playa case, which involved smuggling of cocaine from Colombia to Europe, but was released after three and a half years when the Svea Court of Appeal ruled that the prosecutor had failed to show what role he had in the operation.
His lawyer in the current case, Max Ahlgren, said Falk believed prosecutors had extradited him to Sweden in order to get even, arguing that the case should by rights have been heard in Spain.
"Jonas Falk feels that this is personal. If his name had not been Jonas Falk and he had not been acquitted in “Operation Playa”, this indictment would never have been brought. That is his opinion," Ahlgren said.