Born in Los Angeles, Park moved with her family to Canada when she was 22 months old. She was raised in the Vancouver neighbourhood of Kerrisdale. Park is of Korean heritage and she graduated from Magee Secondary School in 1992 and holds a degree in psychology from the University of British Columbia.
At age 25, Park was cast as high school student Shannon Ng on the Canadian teen soap opera Edgemont.
She appeared in the miniseries Battlestar Galactica in 2003 and continued as the same or related characters in subsequent series and films.
Park had a role in the 2007 movie West 32nd, a crime drama set in New York City's Korean neighbourhood.
She appeared as Lt. Sandra Telfair in Electronic Arts' Command & Conquer 3: Tiberium Wars, along with her Battlestar Galactica co-star, Tricia Helfer.
In 2008, she had co-starring roles in the A&E series The Cleaner until it was canceled on September 25, 2009 and the CBC series The Border until it was cancelled in 2010. In 2009, Park had an uncredited cameo role on the television show CSI: Crime Scene Investigation. She appeared as a fan in a crowd at a science fiction convention, objecting to a gritty remake of a Star Trek-like series, comparable to the Battlestar Galactica remake in which she starred. In 2009 she reprised her role from Battlestar Galactica in the television movie Battlestar Galactica: The Plan. In 2010, she appeared in the Fox series Human Target as Eva Kahn, and is a main character, Kono Kalakaua, in the 2010 CBS revival of Hawaii Five-0.
In 2004, Park married real estate developer Phil Kim. The two live in Vancouver. Park holds dual citizenship in the United States and Canada.
Park was ranked 59th in Maxim Online's 2011 Hot 100 List, 93rd in the "Maxim" Online's 2006 "Hot 100 List" and 81st on the Maxim magazine Hot 100 of 2005 list.