Sorin Mihăilescu played rugby football for the Romanian team that won a bronze medal at the 1924 Paris Olympics. There were only three teams in the 1924 Olympic tournament and the Romanians won the bronze medal despite losing both of their matches badly, losing 61-3 to France, and 37-0 to the United States. Mihăilescu played for Sportul Studențesc in București and played front-row prop forward. Prior to 1920 he played for a club in Nancy, while he was studying in France. He earned four caps for Romania. Mihăilescu played against France at the 1919 Inter-Allied Games, and again played against France in 1927.