You could use xlsread along with xlsinfo.
[status,sheets] = xlsfinfo(filename);
Now, you have all the sheet names under sheets and you loop through that.
data = cell(numel(sheet),1);
for sheetNo = 1:numel(sheet)
data(sheetNo,1) = xlsread(filename,sheets{sheetNo},Range);
...
end
Goodluck!