Yim was born in Seoul. She attended Yonsei University and turned professional in November 2002 while still a student. She was a member of the Korean team that won a gold medal at the 2002 Asian Games.
Yim played on the LPGA of Korea Tour in 2003. Like many other South Korean women golfers, she soon began to play primarily in the United States, joining the second tier Futures Tour in 2004.
In 2005 Yim began playing on the LPGA Tour. In April 2006 she won the Florida's Natural Charity Championship. Paired with Annika Sörenstam for the final round, Yim kept pace with the #1 ranked woman golfer in the world. On the 71st hole with both golfers tied for the lead, Sorenstam hit her tee shot out of bounds resulting in a double bogey. Yim went on to win the tournament by two shots.

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