Sure, you can. Here’s how…

For a Single Task:

1. In the task listing page > choose a task > click on it’s menu > Move to Project
2. Select a project from the drop down > Move

For Multiple Tasks:

1. In the task listing page > select the tasks you wish to move using checkbox
2. Click on the drop down option from top left corner of the listing table > Move to Project
3. Select a project from the drop down > Move