|Representing South Korea|
|1991 Copenhagen||Mixed doubles|
|1994 Hiroshima||Mixed doubles|
As a player, Kang was best known for winning the 1997 All England Open Badminton Championships men's doubles title with Ha Tae-kwon. In the same year, Kang and Ha also won major titles at the Swedish Open and the Korea Open and the following year, they won the Badminton Asia Championships. In the 1994 Asian Games, he won two silver medals, in mixed doubles and in the men's team event. Kang's last international tournament was the 2005 Canadian International, where he appeared in two finals and won the men's doubles title.
Kang began coaching the Korean national team in 2009 and spent one year as the head coach of the national junior team. He was named as the head coach of the senior national team in December 2016, with his term to run from January 1, 2017 to October 30, 2018.
On 2nd September 2019, as reported by Donga Ilbo, Kang Kyung Jin would be signing a contract on Tuesday to join the coaching staff for the Chinese national team. Donga points out that this is a historic turnabout for the badminton superpower as they have never before hired a foreign coach in an official capacity for their national team. The news comes just a week after mighty China was held to a solitary title at the World Championships for only the third time since the nation began sending teams to the event.
- "BKA tournament personnel data". Badminton Korea Association. Retrieved 26 January 2017.
- Choi, In-young (29 December 2016). "National Badminton Team: New Start with Kang Kyung-jin as Head Coach". Yonhap. Retrieved 26 January 2017.