While our project grows, at some point we realized that we need to create new projects and reorganize our dataset. One case is that we need to isolate one dataset from others in
You can first copy BigQuery dataset to the new project, then delete the original dataset.
The copy dataset UI is similar to copy table. Just click "copy dataset" button from the source dataset, and specify the destination dataset in the pop-up form. See screenshot below. Check out the public documentation for more use cases.
Copy dataset button
Copy dataset form