The following are known Action Replay Codes for Tom Clancy’s Splinter Cell on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
1f788eb1
36f03524
0ef9439b
86fca240

Infinite Pistol Ammo
ceee447d
335e4472

Infinite Health
9ef401e1
0253a644
283c7d17
89fd5176

Infinite Lock Pick Time
a0c85677
33168f8d

Low Level Time
751df42f
4b0f3f49