With gplot, you can do a boxplot plot, and then do a scatter plot (with the '+' character, or any character you want), and then 'overlay' them. Here is the basic syntax (you can add more options to "fancy it up" a bit!)...
symbol1 interpol=boxcti color=black;
symbol2 interpol=none value=+ color=blue;
axis1 offset=(5,5);
proc gplot data=sashelp.class;
plot height*age=1 height*age=2 / overlay haxis=axis1;
run;