is there a way to melt sand using a oven?

with a kitchen oven, no

with an oven made for melting glass like glassblowers use, yes

you will need a 1700°C (3090°F) oven

In simple terms NO!!!! 
To melt sand (Silicon dioxide SiO2) you need an electric arc furnace. 

Household ovens don't get to the temperature needed to melt the sand. Sand melts at about 1700 degrees Celsius, while household oven barely reach 500 degrees (self-cleaning ovens),

Most kinds of sand won't melt in a normal cooking oven.  Coral sand, which is mainly calcium carbonate, needs mabye 1500 - 2500 F to melt, and quartz sand (silicon dioxide) needs even higher.  It can melt in a kiln, though.

I try to melt rocks with my acetylene torch sometimes. Too often, they shatter (flake off, moreso; they don't explode...yet) and send meteors at me... too hot to play that game.