Answer

Yes, soybean is generally considered Jain, because it is a seed/bean and not a root vegetable.

Explanation

In Jain food practice, the main commonly avoided plant foods are root vegetables such as potato, onion, garlic, carrot, beetroot, etc., because uprooting them destroys the whole plant and may harm many small life forms in the soil.

Soybean grows as a pod/bean above the ground, so it is generally acceptable in Jain diet.

However:

• Fresh soybean should be cleaned properly.
• Fermented soy products may be avoided by some Jains depending on tradition and level of strictness.
• Packaged soy products should be checked for non-Jain ingredients such as egg, onion, garlic, gelatin, or certain additives.

Takeaway

Plain soybean is Jain, but processed soy foods should be checked carefully for ingredients.