Hi @Oliver Blaskowitz Yes, It is possible but check the below things before doing that.
As Sprint is closed does all the issues in the Sprint are also closed as any open issues will be moved to next open/active Sprint.
If tickets closed and you need them to move to other active/open Sprint and change the status backlog then check their is any workflow property associated with those issues as in sometime not editable property is applied to issues when they are closed if their is no such workflow property then you bulk epic that Sprint
using below JQL
Sprint = (Closed Sprint ID) AND Issuekey in (put the issue key's which you want to remove from this closed Sprint and want to add in other Sprint separated by comma)
Then click on transition issue bulk operation and transition all these issues from Closed status to backlog status or any other status you want and perform the bulk change.
Then use the same JQL above and do a bulk edit and click on Sprint field checkbox and either keep it empty to remove the issues from closed Sprint or add the ID of new Sprint where you want to add these issues, then perform the bulk update.
Let me know in case of any issues.
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