At an early age Sinas lost his mother and was raised by his aunt in Serres (today in Greece), where he lived during his first school years.

Approximately in 1790 he moved with his father, the tobacco and cotton merchant Georgios Sinas the Elder (1753–1822), to the Habsburg residence Vienna, where he finished his ground level studies.

He has contributed financially in the construction of the Chain Bridge (Budapest), the first permanent connection across the Danube between Buda and Pest, which is used even today.

He financially supported the Greek community in Vienna and his family's hometown of Moscopole, modern southern Albania.

[17][18] Moreover, he donated huge amounts of money to philanthropic, cultural and educational institutions of the Greek state, like: Sinas' greatest donation to Greece was the financing of the Athens National Observatory (1845) a work of the Danish architect Theophil Hansen.