She moved to New York City, United States with her family where her guardian was general consulate.
She represented Thailand in Junior World Golf Championships held in San Diego, California, between 1992 and 1996.
[1] On 29 March 2005, Rosjan won the coveted title of Miss Thailand Universe 2005 beating 43 other hopeful young women around the country.
She then went on to compete with 80 other beautiful young women from around the globe in the Miss Universe 2005 pageant held in her home country where she won Best National Costume Award.
She was, however, the third Thai woman to win the pageant's Best National Costume Award, the others being Saengduan Manwong in 1969 and Porntip Nakhirunkanok in 1988.