Sandra Costigan attended the University of New Hampshire, graduating in 1986 with a degree in business administration. She played on the 1987 Pan American Games team, winning a silver medal. She was named to the US National team in January 1987, and competed at the 1985, 1986, and 1987 US Olympic Festivals. At New Hampshire, Costigan was first-team All-American in 1986 and second-team in 1985. She was a Broderick Award finalist in 1986.
|1988 Summer||24||Seoul||Hockey||Women's Hockey||United States||USA||8|
|1988 Summer||24||Seoul||Hockey||United States||USA||Final Standings||8||1988-09-21||3||0||0||0||0||0|
|1988 Summer||24||Seoul||Hockey||United States||USA||Final Round||Match 7/8||2||1988-09-29||ARG 3, USA 1||0||0||0||0||0|
|1988 Summer||24||Seoul||Hockey||United States||USA||Classification Round 5-8||Match #1||2||1988-09-27||FRG 2, USA 1||0||0||0||0||0|
|1988 Summer||24||Seoul||Hockey||United States||USA||Group A||Match #4||2||1988-09-23||ARG 2, USA 1||0||0||0||0||0|