In the present study reports 1,3‐dipolar cycloaddition reactions starting from easily accessible N‐cyanosulfoximines. In a straightforward manner, sulfoximines with N‐1,2,4‐triazolyl and N‐1,2,4‐oxadiazolyl substituents are prepared in good yields, While the former reactions require the presence of Yb(OTf)3 in catalytic amounts, the latter proceed metal‐free.