Can a low oil light cause my 1990 ford ranger to not turn over?

I started my truck a few days ago and it ran descent considering i need new plugs and wires, when i tilted it over on its side (only about six inches on the driver side), it had a small oil drip, when i tried to start it today it wouldnt turn over and whenever i turned the key, the check oil light came on, will it start if i add some oil to it?

No, it's probably just dead.

The oil pressure warning light will be on any time the key is on and the engine is not running. The problem will be elsewhere.

If we need oil? Then add. However the oil light will come on when ignition is on until oil pressure is reached. Then it ought to go out. If it fails to go out? We have oil pressure issue ( don't run engine)
if car simply won't crank over? Then check battery is ok. Try a jump start. If won't crank when jumped? Check starter motor itself.

The very first things to check on an older vehicle when there's a no-start condition are the battery and the electrical connections. Have the battery checked under load then remove and clean every connection from the battery terminals to the starter and the ground connection on the engine block. A low oil level has nothing to do with the starter but starting an engine without sufficient oil can be disastrous. The starter will turn the engine over regardless of the amount of oil in the crankcase unless the engine is seized from operating without lubrication.

The oil light you're seeing, indicates that the oil pressure is low, not necessarily the oil level. Have you actually checked the oil level via the dipstick yet? Also, FlagMicheael is correct. The light will come on when the key on in the run position and the engine is not running anyway.