I don't think that there is a native way to do this. You can assign URL to an image, but you cannot link to a sheet. Also you can use KPI object to link to another sheet, but you cannot use an image there. There is this extension as well - Qlik Branch - that gives you buttons but not images.
Try Climber KPI: https://github.com/ClimberAB/ClimberKPI
1. Create a Climber KPI object
2. Set the measure: =' '
3. Appearance -> Layout -> Background image -> set your image
4. Appearance -> Hover -> Navigation -> Select your sheet. You can set the text when hover your mouse in the image or just let it blank, show button or set overlay opacity.