Sandra Hoyn studied photography at the University of Applied Sciences Hamburg, Germany, graduating in 2005. She started working as a freelance photojournalist for magazines, NGOs and on her personal projects, concentrating on social, environmental and human rights issues. She worked in various countries in Asia, Africa and Europe. Since 2007 she has been represented by laif, agency for photos and reports.
In 2015, she received World Press 3rd prize, category nature singles. In 2014, she was selected by LensCulture as one of the Top 50 Emerging Talents. In 2013, she received the Henri Nannen Award. In 2012 she got second place at IPA - International Photography Awards in the category Professional editorial sports. That year she was also awarded three silver medals by the Prix de la Photographie, Paris (Px3) for her features. In 2011 and 2007, she received scholarships from VG Bild-Kunst.