It is rare to find an internship after your first year, but it's always possible. I'd suggest trying to find some sort of coop/internship before your senior year at the latest. My roommate had a couple internships his sophomore and junior year and companies were jumping all over him. Meanwhile, I had a much harder time finding a job since I never did an internship and just worked over the summer.
That being said, if you don't find anything now I wouldn't sweat it. That "lots of spare time" disappears very quickly as the years go by, so I'd enjoy it.