You will still use Form 8958 however, if filing Married Filing Separately with a nonresident spouse, you will not allocate your income the same way as all other taxpayers filing separately in a Community Property State.
Let me first point out that you are not restricted to filing separately just because your spouse is a nonresident, you can also file Married Filing Jointly.
Here is a link that explains your options.
If you still decided to file separately, and you live in a Community Property State, such as California, YES use Form 8958. When you allocate (assign) income and withhold, you follow the rules listed in IRS Pub 555 as if you and your spouse lived apart. You do NOT split your earned income.
According to the IRS:
Nonresident alien spouse.
"If you are a U.S. citizen or resident alien and you choose to treat your nonresident alien spouse as a U.S. resident for tax purposes and you are domiciled in a community property state or country, use the community property rules. You must file a joint return for the year you make the choice. You can file separate returns in later years. For details on making this choice, see Pub. 519, U.S. Tax Guide for Aliens.
If you are a U.S. citizen or resident alien and don't choose to treat your nonresident alien spouse as a U.S. resident for tax purposes, treat your community income as explained next under Spouses living apart all year."....
"Earned income.
Treat earned income that isn't trade or business or partnership income as the income of the spouse who performed the services to earn the income. Earned income is wages, salaries, professional fees, and other pay for personal services.
Earned income doesn't include amounts paid by a corporation that are a distribution of earnings and profits rather than a reasonable allowance for personal services rendered.
Trade or business income.
Treat income and related deductions from a trade or business that isn't a partnership as those of the spouse carrying on the trade or business.
Partnership income or loss.
Treat income or loss from a trade or business carried on by a partnership as the income or loss of the spouse who is the partner.
Separate property income.
Treat income from the separate property of one spouse as the income of that spouse.
Social security benefits.
Treat social security and equivalent railroad retirement benefits as the income of the spouse who receives the benefits.
Other income.
Treat all other community income, such as dividends, interest, rents, royalties, or gains, as provided under your state's community property law."
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