Generally, no — sago pearls (sabudana) made from tapioca/cassava are not considered suitable in Jain diet, because cassava is a root vegetable, and root vegetables are avoided in Jainism.

If it is true sago from palm pith and not from any root, some people may consider it differently, but the common sabudana used in food is usually from tapioca, so it is better to avoid it.

If you want, I can also give you a Jain-allowed fasting food list.