It cannot be killed by attacking it directly, because when its HP reaches 0, it will only become immobilized for a short period of time. The way to defeat the Sand Golem for good is to destroy the Core within it.
The Golem can counter both magic and physical moves if the Core is attacked, so immobilizing the Sand Golem first avoids the counter. However, the Core will revive the Golem after a brief period of time. The Sand Golem uses the Fira spell for its regular attack, and a physical counter when the Core is attacked.
[view·edit·purge]In Jewish and Medieval folklore, a golem is an animated anthropomorphic being, magically created entirely from inanimate matter. The word was used to mean an amorphous, unformed material (usually out of stone and clay) in Psalms and medieval writing. Adam, the first man created by God in the Holy Bible, was a golem since he was created from dust and sand. Having a golem servant was seen as the ultimate symbol of wisdom and holiness, with stories of prominent Rabbis owning golems throughout the middle ages. In modern times, the word golem, sometimes pronounced goilem in Yiddish, has come to mean one who is slow, clumsy, and generally dimwitted.