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Explanation: on whether you want an "authentic" (or nearly authentic) Chinese name, which would be usually three, but sometimes two, Chinese characters. The first character is the surname, which is chosen from a fairly small pool of candidates, and usually would be something that starts with the hard "g" sound to match your surname. The other two characters could really be anything. Usually parents choose the characters for meaning and a nice sound, although in this case you're starting with the phonetic sound and going backwards.
No offense to the previous poster, but the phonetic sound of the name suggested is not "shawn" as "sean" is pronounced, but more like "shiau un". You really can't get away from 2 syllables if you are using 2 characters, so that's not the problem...Actually "Sean" is a really tough name no matter what language you're talking about (used to have a handicapped friend named Sean whose speech synthesizer had to be trained for hours to say his name correctly!)
If you just want the name to put on a decoration or similar, then the suggestion above is fine, nothing offensive about it, certainly.