Kim Sun-yong Jr. (born 26 May 1987) is a South Korean former professional tennis player.

Kim, who was born in Seoul, won the junior doubles title at the 2005 Australian Open, partnering Taiwan's Yi Chu-huan.

[1] A right-handed player, Kim featured in three Davis Cup ties for South Korea.

In 2005 he won both of his singles matches against Pacific Oceania, then played a dead rubber in the Group II final against New Zealand, which he lost to Jose Statham.

[2] His only other appearance came in 2007, when he won in the singles against Dmitriy Makeyev of Kazakhstan.