He lived in France until his death in 1672.
. After his abdication in 1668, John Casimir Vasa went to France, where, thanks to the intercession of King Louis XIV, he was assured income from Benedictine abbeys, including Saint-Germain-des-Prés in Paris. He lived in France until his death in 1672, which is said to have occurred as a result of apoplexy suffered on hearing of the fall of the fortress at Kamieniec Podolski during the Polish-Turkish War.

Three years later, John Casimir's body was brought to Wawel Castle and buried there at the beginning of 1676. John Casimir's heart was deposited in the church of Saint-Germain-des-Prés, where a magnificent monument was created by the brothers Gaspard and Balthazar Marsa, court sculptors of the French king, known for their numerous works found, among others, in the Tuileries Palace in Paris and Versailles. The composition of the monument, contained in a semi-circular niche, the upper part of which is revealed by a gaping curtain of yellowish-brown marble, consists of two parts. The statue of the kneeling king handing over the insignia of power is made of white marble. The lower part of the monument, in the form of a sarcophagus made of black marble, is filled with a bronze bas-relief depicting the Battle of Beresteczko, in which John Casimir was victorious over Cossack-Tartar troops. The author of the bas-relief was the monastery sculptor Jean Thibaut.

The tomb was saved thanks to the intervention of Alexandre Lenoir
. The monument was damaged during the French Revolution, but was nevertheless saved thanks to the intervention of Alexandre Lenoir, who had it moved to the Musée des monuments français, created in the former Augustinian monastery and opened to the public in 1795. In this way, John Casimir's tomb avoided the fate of many other monuments associated with ruling families and irretrievably destroyed in France in the 1790s. The masterpiece of the Marsa brothers was returned to the Saint-Germain-des-Prés church a dozen years later, during the restoration of the French monarchy.