For this you need to deactivate your trigger and for deactivating in production is not possible so first you need to deactivate it on Sandbox then deploy to production later perform data loader operation.
Because best practices advise you to use single trigger + Handler class you can create a custom setting to store state of your Handler classes and based on that execute Handler code or skip it. Even simpler you can have a static boolean field and to disable all your Handler objects. Thease kind of control points come in handy. This way youl will not have to redeploy your class to production which can be risky because somebody may be working on it and testing some modifications.
For this you need to deactivate your trigger and for deactivating in production is not possible so first you need to deactivate it on Sandbox then deploy to production later perform data loader operation.
Thanks!!