Ring shaped SIMD pads can be made with complex pads.
If you just need a copper ring than it is quite easily done.
- First place a graphical circle with the correct diameter and width on any layer.
- Put a circular SMD pad anywhere on this circle (such that the pad is fully covered by the circular line)
- Select both the graphical circle and the pad.
- Right click -> Create pad from selected shapes
If you need a complex paste layout then maybe use freecad with stepup as shown in Kicad StepUp: The Sketcher for Footprint generation
If your paste layout is a simple segmentation like in Mounting_Wuerth_WA-SMSI-4.5mm_H1mm_9774010482 then you can use the generator i wrote https://github.com/pointhi/kicad-footprint-generator/blob/master/scripts/PadGenerator/RingPad.py