No. They are not contagious. It is common for people to assume Fordyce Spot happens due to viral infection and fear that they may contract it from their partners. The anxiety increases manifold when they happen to see these spots for the first time with a new partner.
People tend to get panic when they spot Fordyce spots in their own genitalia, particularly during the first time when they happen to see this unwanted lump sneaking its head out. As it not caused due to virus or bacteria, you need not worry about spreading. So, Fordyce spots are not contagious and you can have sex with a partner having it, if you are ok.
It is always recommended to use a condom to protect yourself from anything including Fordyce Spots.
If you find it embarrassing to have sex with your partner having spots on your shaft, you can choose a coloured condom which can give the spot a good cover allowing you to enjoy a happy time with your partner.