Growing up in Honolulu, Hawaii Shim attended high school at Kamehameha Kapalama High School. Her senior year she was the co-winner of the Kamehameha School Female Athlete of the Year Scholarship. While with the high school team they won three ILH Championships. Her junior year of high school she went to Arizona to play for Sereno, a Nike Premier sponsored club one of the top U-16 teams in the nation. She also played club soccer in Hawaii for Ho'okalakupua helping take the team to the Region IV finals in two seasons.
After high school she attended Santa Clara University on an athletic scholarship playing as a midfielder from 2009 to 2012. She played in 20 games her freshman year, scoring her first goal against Stanford on October 1, 2009. Shim played in the NCAA Tournament where she had an impressive 7 shots in three games and started in the second round game against Oklahoma State. Her second year she played in all 22 games and started in 18 of them. She was an All-West Coast Conference honorable mention for the season after scoring a goal and three assists on the season. Shim improved on that her junior year scoring 4 goals and 4 assists starting all 21 games. She went 3-3 on penalty kicks that season as well. She also received All-WCC Second Team honors. In 2012 Shim was the Broncos team captain playing in 19 games scoring 3 goals and 1 assist. In the first round of the NCAA Tournament she scored one of the teams goals against Long Beach State in a game they went on to win 2-1.
Undrafted in the NWSL College Draft she made her way on to the roster for the Portland Thorns through open tryouts and worked her way into the starting lineup. Shim initially played as a forward for the team but was eventually moved back to her natural position of midfield. She scored her first goal for the team against the Seattle Reign FC with a left footed shot. She later had a scoring streak scoring in four consecutive matches. She played in 19 games and scored a total of 5 goals and 2 assists for the Thorns leading her to be named the teams Newcomer of the Year.
Shim has participated with the U-23s since 2012 first being called into training camp in May. She started the June 19 game against Norway. She played in the Three Nations Tournament getting time on the field in both games.
The left footed midfielder is also capable of playing forward but is strongest in the midfield. Shim is very coach able and looking to constantly improve upon on her already strong technical ability.