I think the sunshine song you were looking for was Andreas Johnson "Sunshine of Mine." He's Swedish, which may be the reason you heard it on an international radio station.
hi this is in regards to the song you were searching by the name of Sunshine...
the right song is on the link below
http://www.youtube.com/watch?v=Sm1hIPet1O0
Please be patient becoz sunshine was on no 1 spot so it will start at 1.20..enjoy