Born and raised in Venice by a Greek mother and an Italian father, Sofia Valleri pursued a degree in law at the State University of Milan. Alongside her legal studies, she honed her acting skills through various workshops in Rome, Los Angeles, and Milan. In 2013, Sofia gained recognition in Italy through the global Brosway campaign, which propelled her into the fashion world.

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From 2013 onwards, she became the face of numerous Italian and international fashion brands, including Pittarello, Couture Anonyme, and My Shapes. Sofia also served as the ambassador for the International Carnival of Venice and the International Carnival of the Seychelles. In 2014, she appeared on the Chiambretti show on Italia 1. The following year, she made her big-screen debut as an Arabian princess in the film Game Therapy and became a spokesperson for Nikon. Additionally, she traveled to Chile to star in a commercial as a sexy pilot alongside Chilean footballer Mauricio Pinilla. In 2016, she represented US POLO, and in 2017, she became the face of Marisa Padovan's international haute couture beachwear campaign.

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In 2021, Sofia participated in the TV show "ALL TOGETHER NOW" on Canale 5, and in 2022, she presented the Monte Carlo Fashion Week in the presence of HSH Princess Charlene of Monaco.