Hey there,
At the moment there is no way to obtain Sandbeast bile glands in Siptah, at least without requiring major RNG luck or admin powers.
Our team is aware and in the future we’ll either add a way to obtain this resource, or weed out any recipes requiring it from the Isle of Siptah map.
This is a quote from Ignasis to a thread back im September.
Now that we get the yakith hounds as pets, is there a possibility to have them drop the glands? Like having a Couple in a armored pen and they produce the glands slowly overtime?