A native of the city of Jelenia Góra, then the seat of Jelenia Góra Voivodeship and, since 1999, part of the Lower Silesian Voivodeship, Sandra Magdalena Lewandowska studied "enterprise management" at the Regional and Tourist Economy Department of Wrocław University of Economics, graduating in 2002 with a major in business operations.
Although initially associated with the Democratic Left Alliance, she was also a member, from 1999 to 2001, of Polish Socialist Youth Union and, between October 2001 and October 2004, was a leader in the Alliance's Jelenia Góra youth chapter as well as deputy leader of the city's Stowarzyszenie Młodej Lewicy Demokratycznej [Young Democratic Left Association].
She was an organizer of parliamentary debates on national security issues, including the benefits and risks connected with the installation of elements of the American anti- ballistic missile (ABM) defense system on Polish territory.
She participated in a research trip to the United States that included a visit to the U.S. Missile Defense Agency (MDA) in Washington, D.C., with representatives of the Polish Embassy.
Her newfound celebrity/notoriety resulted in an invitation to participate in the 6th season of Taniec z gwiazdami, partnered by professional dancer Michał Skawiński.