You can get the soundtrack on iTunes but here are the songs on the soundtrack:
I'm Gonna Be (500 miles) by: The Proclaimers
Benny & Joon by: Rachel Portman
Snorkel Mask by: Rachel Portman
Joon's Medicine by: Rachel Portman
Hubcaps by: Rachel Portman
Sam's New Home by: Rachel Portman
Balloon by: Rachel Portman
In the Park by: Rachel Portman
Love Theme by: Rachel Portman
Sam is Kicked Out by: Rachel Portman
On the Bus by: Rachel Portman
Swinging by: Rachel Portman
Sam and Joon by: Rachel Portman
Benny & Joon by: Rachel Portman
:D