Sanders secured just below a whopping 72 percent of the 717 votes cast in Sweden, compared to 28 percent for Hillary Clinton, Democrats Abroad reported on Monday.
The Vermont senator also won with a clear majority worldwide at 69 percent of the vote.
Unlike the Republican Party, the Democrats have allowed the party's international branch to host a Global Primary since 2008, where expats can vote in-person with the group Democrats Abroad, which is given state-level recognition in the Democratic National Committee.
The group will send 13 delegates and eight super-delegates this year to the Democratic National Convention, which is more than the state of Wyoming's total of 18.
Sanders picked up nine pledged delegates in the global primary, while Clinton secured an additional four delegates.
“Democrats Abroad congratulates Bernie Sanders for winning the Global Presidential Primary,” wrote internation chair of Democrats Abroad Katie Solon in a statement.
“We are proud of the unprecedented turnout. A diverse constituency of Democrats of all voting ages, living across the globe, brought their perspectives and priorities to our party's nominating process. These enthusiastic voters will lead their fellow Americans living outside the US to vote from abroad in November.”
Meanwhile back in the US, Sanders has been trailing behind Clinton, who currently has won 1,139 delegates compared to his 825. To win the nomination, a candidate needs 2,383 delegates.
An estimated 8.7 million Americans live abroad – more than the population of Virginia (8.3 million), which is the 12th largest state. A total of 19,515 US-born people lived in Sweden in 2015, according to number-crunching agency Statistics Sweden.
This year, Democrats Abroad voting centres were set up at around 150 places worldwide, including in Stockholm, Gothenburg, Halmstad and Uddevalla at the beginning of the month.
More than 34,000 people voted in the primary worldwide, far exceeding 2008's battle between Clinton and Barack Obama by 50 percent, according to Democrats Abroad.
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