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Sommer made 94 appearances for his country since making his debut in 2012.
Xabi Alonso's team, who have now gone a league-record 29 matches without defeat this season to secure their first trophy since 1993, have a 16-point lead over Bayern with five matches remaining.
Bayern CEO Jan-Christian Dreesen said there would a 'a new direction' next season with a new coach.
The attacking full-back and dead-ball specialist became an instant Germany football great when his spot-kick earned them a 1-0 victory over Diego Maradona's Argentina in the World Cup final in Rome in 1990.
Borussia Dortmund needed a win to lift the title but ended up drawing 2-2 with Mainz.
His recent Bundesliga scoring form has now spilled over to the World Cup and 'The Gap', as he is know due to a space between his front teeth, is being hailed as Germany's improbable hero.
Japan scored a thrilling 2-1 win over favourites Geramany in Group E.
The Baverians sealed the title with a 3-1 win over rivals Borussia Dortmund and with three games to spare.
Poulsen expressed confidence that the team will bounce back under new coach Domenico Tedesco.
Nagelsmann's contract at Leipzig ran to 2023 and Bayern reportedly agreed to a payment that could exceed 20 million euros ($24.13 million) for his release, making his one of the most expensive club coach signings in Europe.
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