CD-singel, Storbritannien (0523202)
- "Sometimes" [Radio Edit] — 3:55
- "Sometimes" [Soul Solution Mid-Tempo Mix] — 3:29
- "I'm So Curious" (Britney Spears; Eric Foster White) — 3:35
Promo 12" Vinyl, Storbritannien (052320.0P)
- "Sometimes" [Thunderpuss 2000 Club Mix] — 8:02
- "Sometimes" [Soul Solution Dub] — 10:12
- "Sometimes" [Soul Solution Extended Mix] — 6:59
- "Sometimes" [Thunderpuss 2000 Radio Mix] — 3:50
CD-singel, Europa/Australien (0550142)
- "Sometimes" [Radio Edit] — 3:55
- "I'm So Curious" — 3:35
- "Sometimes" [Soul Solution Mid-Tempo Mix] — 3:29
2-spårs CD, Europa (0580382)
- "Sometimes" [Radio Edit] — 3:55
- "Sometimes" [Soul Solution Mid-Tempo Mix] — 3:29
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CD-singel, Japan (AVCZ95121)
- "Sometimes" [Radio Edit] — 3:55
- "...Baby One More Time" [Sharp Platinum Vocal Remix] — 8:11
- "...Baby One More Time" [Davidson Ospina Club Mix] — 5:40
Promo CD, USA (DUTCH19)
- "Sometimes" [Thunderpuss 2000 Club Mix] — 8:02
- "Sometimes" [Mike Ski's Drum Dub] — 4:56
- "Sometimes" [Soul Solution Mid-Tempo Mix] — 3:29
- "Sometimes" [ThunderDub] — 7:18
- "Sometimes" [Mike Ski's 3AM Bass Bin Destroyer Mix] — 9:34
- "Sometimes" [Original Radio Edit] — 3:55
- "Sometimes" [Boris & Beck Roxy Dub] — 6:51
- "Sometimes" [Beats Of Thunderpuss] — 4:27
Singel, Nederländerna (The Singles Collection, Boxset Single)
- "Sometimes" [Radio Edit] — 3:55
- "I'm So Curious" — 3:35
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