Quang Huy Mobile from Nha Trang beat Ho Chi Minh City's MASECO 3-2 in a penalty shootout at Thong Nhat Stadium to claim the 6v6 national title on Sunday.
Quang Huy Mobile will represent Vietnam in a 10-country six-men tournament in South Africa on July 1.
This is the second time Vietnam has a six-men football squad competing at the Budweiser 6v6 Cup World Finals.
Last year, the Vietnamese squad advanced to the final match at Manchester United's Old Trafford Stadium in England, where it lost to Argentina in a dramatic penalty shootout.
"We are happy to be going to South Africa and honored to be representing Vietnam," said Nguyen Huu Dang, manager of Quang Huy Mobile. "But we aren't satisfied. We want to go one step further than last year's team and win it all."
"For Quang Huy Mobile to win the national competition is a huge accomplishment," said Xavier Codron, managing director of Budweiser Vietnam.
"There were twice as many teams in the field this year and the skill level was noticeably higher. It will be fun to see how this team does against the likes of Brazil and China."