In 1953, Sand was apointed Assistant United States Attorney for the Southern District of New York, serving in the Criminal Division, which was followed by two years in private practice with the firm of Rosenman, Goldmark, Colin & Kaye.
In 1953, J. Edward Lumbard appointed him to the position of Assistant United States Attorney for the Southern District of New York. From 1954 to 1956, Sand was in private practice with the firm of Rosenman, Goldmark, Colin & Kaye.