Desert Monsters Drop Sand
Husks and Parched drop sand and red sand upon death, allowing them to be farmed.
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Desert Monsters Drop Sand

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Husks and parched drop 0-3 sand and 1-2 extra per level of looting. - 1-5 sand with Looting I - 2-7 sand with Looting II - 3-9 sand with Looting III
They have a 25% chance to drop red sand instead when on fire and +25% chance per level of fire aspect. - 50% with Fire Aspect I - 75% with Fire Aspect II
They always drop red sand when killed in a badlands biome.
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*This is my take on many already existing packs that make husks drop sand. Parched now spawn alongside husks in desert biomes, meaning there's less space in the mob cap for husks to spawn, which would harm your sand rates. It's been almost six weeks since 1.21.11 released, and none of those datapacks have updated to include the parched, so I decided to do it myself.*