S = shaperead(filename) ;
Now you have your lat, lon coordinates in S..extract them and plot. Mostly the following shall work .
S = shaperead(filename) ;
lon = [S(:).X]';
lat = [S(:).Y]';
plot(lon,lat)
NOTE: You have asked more or less the same question here: https://in.mathworks.com/matlabcentral/answers/461212-add-world-map-background-to-contour-plot?s_tid=prof_contriblnk. You should comment/ accept your question there and ask for another question. It is not fair to leave the answer without giving any credits.
