"Sandstorm had a quick temper and a strong sense of what was right, which Firestar respected. Next to his deputies and medicine cats, Sandstorm was the cat Firestar consulted most often before making any decisions for the Clan."—Narrator in The Ultimate Guide, page 19
Sandpaw became an apprentice. Her mentor was Whitestorm. She became friends with Dustpaw. After Firepaw joined the group, it became clear she didn't like him. Graypaw and Ravenpaw became friends with Firepaw but Sandpaw and Dustpaw kept on picking on him, calling him names like kittypet, and other insulting things.
She had been an apprentice longer, but it was Firepaw and Graypaw who became warriors before them. Fireheart saved her from falling off of a cliff. After this, she became friends with Fireheart. When Fireheart was made a warrior, he helped her finish her apprentice training. He did this by telling Bluestar that if she and Dustpaw fought in the battle, they would have gotten their names too.
Finally, Sandpaw was given her warrior name Sandstorm. She and Fireheart became friends, this made Dustpelt jealous. She soon started to like Fireheart but he didn't notice right away. After Fireheart became deputy did he finally understand. She was a bit jealous with Cinderpelt, since Fireheart went to her for help instead of talking to her. She got over this and became Fireheart's mate.
Tigerstar killed her mother, Brindleface, to give the dog pack a taste for cat blood making her half-brother and half-sister angry. They were Ashfur and Ferncloud. After the fight with BloodClan, Sandstorm sat with Firestar and Graystripe and watched the sun rise.
Then she and Firestar had two kits together, Squirrelflight and Leafpool, Leafpool grew up to be a medicine cat, and she had three kits, Hollyleaf, Lionblaze and Jayfeather, her apprentice. Squirrelflight had four kits, Sparkpelt, Alderheart, Dandelionkit, Juniperkit. During the Great battle, Spottedleaf dies so Sandstorm can still be alive.
Sandstorm later retires to the elders' den. In The Apprentice's Quest, she dies of infected wounds.