SNSD is a Korean pop group otherwise known as Girls' Generation outside of Asian.
In Korean, it is "So Nyeo Shi Dae", to be honest I can almost pronounce it the same in Chinese. In Chinese it is 少女時代 and the pinyin for it is "Shao Nu Shi Dai" which also turns into SNSD.
As far as I know these 2 languages don't share anything common. Is it just a coincidence that the acronym SNSD is the same in both languages?