The ornamental design for a supportstand for playgroundglobe, as shown and described.
FIG. 1 is a top front perspective view of a support stand for playground
globe showing my new design; the broken lines showing a globe is for
illustrative purposes only and form no part of the claimed design;
FIG. 2 is a front elevational view thereof; the rear elevational, right
side elevational and left side elevational views being identical;