The following are known Action Replay Codes for Sword of Mana 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
145cefe4
fc50f7f9
cd58c28c
b5fe4a3c

Infinite Lucre
b7260b58
9cfb5355

Infinite of All Items
f9abdc5e
d727755e
8fe3bbb5
91b13030

Infinite of All Accessories
161109eb
56e556ac
27b78692
bbf212df

Herp: Infinite HP & MP
6188c1be
c674931d
3d353d22
0d0c1d2b

Heroine: Infinite HP & MP
cbe9f9a7
3fe645e0
15b5f171
416aad4d