No,the answer Lias gave was wrong,they are different,
1.你可以这样做is totally right.
2.你可以这样地做is also right on grammar but we usually don't use "地" for ii is not necessary.
3.你可以这样得做is wrong,because 得is not right here,the word after 得must be adj. or adv,but 做 is a verb,so this one is wrong.
e.g.:她长得漂亮means:she looks beautiful.
她跳得高 means:she jumps high.
Hope that helps.