Sandman previously served as chairman of the board of Whitman-Walker Health and as a member of the boards of the Neighborhood Legal Services Program of the District of Columbia, the International Senior Lawyers Project, the NALP Foundation for Law Career Research and Education, Wilkes University, and the University of Pennsylvania Law School. He also has served on the scholarship selection committee of the Minority Corporate Counsel Association.
Sandman was named one of the “90 Greatest Washington Lawyers of the Last 30 Years” by the Legal Times in 2008. The University of Pennsylvania Law School has honored him with its Alumni Award of Merit and its Howard Lesnick Pro Bono Award. He has also received the Wiley A. Branton Award from the Washington Lawyers' Committee for Civil Legal Rights and Urban Affairs, the Women’s Bar Association of the District of Columbia’s “Star of the Bar” Award, D.C. Law Students in Court’s Celebration of Service Award, the Washington Council of Lawyers Presidents' Award, the Council for Court Excellence's Justice Potter Stewart Award, and Tahirih Justice Center’s Wings of Justice Award. He was awarded an honorary Doctor of Humane Letters degree by the College of Saint Rose, where he was the 2013 commencement speaker. In 2014, he received Villanova University's Medallion Award and was the commencement speaker at Villanova Law School.
Sandman is a summa cum laude graduate of Boston College, where he was elected to Phi Beta Kappa, and received his law degree cum laude from the University of Pennsylvania, where he served as executive editor of the law review and was elected to the Order of the Coif. He began his legal career as a law clerk to Judge Max Rosenn of the U.S. Court of Appeals for the Third Circuit.