Wiśniewski was born in Włodawa. His mother trained handball and his father is a former footballer. On 10 May 2014, Wiśniewski married Katarzyna (née Łuszczewska). On 2 January 2017, his wife gave birth to their daughter Aleksandra.
Career
National team
Wiśniewski made his debut in the Poland national team on 30 May 2010 in a friendly match against France. In December 2011, Poland, including Wiśniewski won a silver medal at the World Cup. He is also a gold medallist at the 2012 World League .