Wednesday's win for the Asian champions from South Korea means they claim fifth place in Japan ahead of Sundowns.
Kim Bo-kyung, Lee Jong-ho and an own-goal from Ricardo Nascimento gave Jeonbuk a 3-0 lead before half-time.
Percy Tau scored for Sundowns early in the second half before Kim Shin-wook's header sealed the win.
Sundowns lost to Japanese champions Kashima Antlers 2-0 in their other game on their debut at the tournament on Sunday.

Bath's injured Faletau will not resume training until the middle of November.
Wales coach Rob Howley has included him in his squad for the four-match series.
"Wales need to find a different option and maybe give them a run of games through these matches that will provide Toby with competition," Delve said.
Faletau suffered a knee injury in September on his Aviva Premiership debut for Bath, who do not expect the British and Irish Lion to start training until the middle of November.
"Although it's a huge loss to Wales you have to weigh up the value of rushing him back for those possible last two games or get him completely fit and firing for the Six Nations and the Lions tour," added Delve, who also played for Bath.
Wales play Australia in Cardiff on 5 November, followed by Tests against Argentina and Japan, concluding against South Africa at the Principality Stadium on 26 November.
Faletau and his likely replacement Ross Moriarty of Gloucester would not be available for the opening game against Australia.
The game falls outside World Rugby's international window and Premiership Rugby will not sanction the release of English-based Welsh players.
Northampton Saints wing George North, Harlequins centre Jamie Roberts and Bath pair Luke Charteris and Rhys Priestland will also be unavailable for the Wallabies game.
Ospreys fly-half Sam Davies has been included in Howley's squad after his recent performances for the region.
"I think Sam has really put himself in the mix. His early season form has been fantastic," said Delve, a former Ospreys team-mate.
"It's a nice headache to have and it will be interesting to see if Sam Davies does get a run through the course of the four games.
"Whether he gets the opportunity to get that backline moving in the way that Rob has said he wants to evolve."

Earlier this month, the force said 24 people had been charged with possession with intent to supply Class A drugs.
On Friday, it said five more people had now been charged, bringing the total to 29 and they are all from the city.
Police raided 35 addresses on 26 April during an operation involving 200 officers.

Walt Disney said subscriber numbers for its sports channel ESPN had dropped. Viewers are moving away from packages offered by cable companies to simpler services and stand-alone streaming.
Time Warner also fell 9%, despite better-than-expected profit  figures.
The Dow Jones shed 0.06% to 17,067 points.
The S&P 500 gained 0.31% to 2,099.88 points. The Nasdaq rose 0.67% to 5,139.95 points.
Discovery Communications fell 13% after reporting lower advertising sales and a strong dollar for below forecast profits.
Twenty-First Century Fox were down 7%, CBS down 5% and Viacom shares 7%.
Barton Crockett, an analyst at FBR Capital Markets, said: "If Disney can get dinged, maybe nobody's safe."
But bucking the trend, Dish Network reported higher-than-expected revenue and profit and shares rose 4%.
Priceline Group rose 6% after the travel company reported profit and revenue that beat analysts' forecasts.
First Solar, up 17% and Ralph Lauren, turned an earlier 2.3%, gain into a loss of 1% despite releasing results that pleased investors.
Economic data was disappointing.
Private employers hired 185,000 workers last month, according to the ADP National Employment Report. That fell short of economists' forecasts for an increase of 215,000.
The report also revised down June's private payroll gains to 229,000 from the 237,000 reported before.
Investors will be looking to Friday's non-farm payroll data.
African Champions League winners Mamelodi Sundowns of South Africa lost again at the Club World Cup going down 4-1 to Jeonbuk Motors in Osaka.
[NEXT_CONCEPT]
Taulupe Faletau's absence at the start of the autumn internationals presents an opportunity for another forward to stake a claim for Wales, says former number eight Gareth Delve.
[NEXT_CONCEPT]
Twenty-nine people have been charged following drugs raids in Newport, Gwent Police has said.
[NEXT_CONCEPT]
(Close): Disney shares closed down 9% after disappointing earnings figures sparking share price falls in rival cable companies.