Voynov started playing in 1972 and spent the whole of his career as a player in Levski Sofia until 1981.

He played 226 games and scored 36 goals in A PFG all for Levski.

He appeared for the Bulgaria national team in 32 matches and took part in World Cup tournament in 1974 with it.

He coached FC Iskar, Hebar Pazardzhik, Belasitsa Petrich, Rodopa Smolyan, Slivnishki geroi, Minyor Pernik, Akademik Sofia, Lokomotiv Mezdra, Bansko, Lyubimets, Rilski Sportist and currently Lokomotiv Plovdiv.

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