In addition to this list, the Super Famicom Magazine Supplements have tracks from the following games (all SFC obviously):
SD Gundam Gaiden: Knight Gundam Monogatari - Ooinaru Isan (4699 - Vol 2)
SD Kidou Senshi Gundam 2 (5311 - October News Volume)
SD Kidou Senshi Gundam: V Sakusen Shidou (5267 - Vol 5)
Super Gachapon World: SD Gundam X (5265 - Vol 4)
Outside of these, there's also:
Mobile Suit Gundam: Side Stories,
Mobile Suit Gundam Side Story: The Blue Destiny,
Gundam Side Story 0079: Rise from the Ashes,
Mobile Suit Gundam: Zeonic Front, and
Mobile Suit Gundam: Encounters in Space (77499 - MOBILE SUIT GUNDAM SIDE STORIES SERIES ORIGINAL SOUNDTRACK)
SD Gundam G Generation Advance (27515 - SD Gundam G Generation Advance Double Premium Disc)
SD Gundam Gaiden 2: Entaku no Kishi (34327 - SD Gundam Gaiden 2: Entaku no Kishi abd 104863 - Mobile Suit Gundam SD Otogarami Dai Utaawase)
SD Gundam World Gachapon Senshi: Scramble Wars (12373 - Disk System Selection Iitokodori CD SIDE B)
Gundam Breaker,
Gundam Breaker 2, and
SD Gundam G Generation Frontier (65047 - BACK-ON ANIGE SONG COLLECTION)
SD Gundam G Generation Genesis
Mobile Suit Gundam: Multiple Operation (10342)
G-Saviour (PS2) (4989 & 27511)
And outside of games:
Every single SD Gundam entry outside of Mk-II and SD Gundam Force
G-Saviour (8543)
Mobile Suit Gundam AGE: Memory of Eden (40662)
Mobile Suit Gundam Wing Blind Target
∀ Gundam I: Earth Light, and
∀ Gundam II: Moonlight Butterfly (20098)
Gundam EVOLVE
Mobile Suit Gundam MS IGLOO (The Hidden One-Year War, Apocalypse 0079, and MS IGLOO 2: Gravity of the Battlefield need a separate page each)
Wing: Endless Waltz - Special Edition (21798)