In strict Jain diet, sabudana is generally not allowed, because it is made from tapioca/cassava root, and root vegetables are avoided in Jainism due to ahimsa.

So:

• Strict Jain practice: Not allowed
• If someone follows a relaxed dietary practice: they may consume it, but that is not according to strict Jain principles

If you want, I can also tell you about other common foods and whether they are allowed in Jainism.