There are at least five artists who go by "Sona":
1) Yoon Son-ha (born 15 October 1976, Jeonju, Jeollabuk-do, South Korea) is a Korean actress, singer and television personality (gaijin tarento). She is signed onto Sony Music Japan's SME Records division. Since making her debut in the MBC dramas, she has acted in Korea and Japan, probably due to her fluency in Japanese as well as in her native Korean, where she has gained popularity from starring in the Fuji TV drama, Fighting Girl with co-star Kyoko Fukada. Read more on Last.fm