If you loved Sunshine, try 28 Days Later
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Danny Boyle, and they both carry the dread mood tag, and they sit in Science Fiction / Thriller territory. If that's the register that drew you to Sunshine, the second film will land in a comparable space — through a different lens.
dread
What 28 Days Later is
Abandoned London streets, summer haze, a lone bicycle. A small band of survivors navigates a desolate cityscape, pursued by the infected, their rage unrelenting. Boyle propels this nightmare forward with frenetic energy.

