TOKYO-- Sony Corp. said this fiscal year is shaping up to be profitable across all its main businesses, marking what executives see as the successful end of a turnaround plan.

Sony struggled for years to pare back unprofitable businesses, often earning low profits when weakness in businesses such as smartphones canceled out strengths elsewhere. But for the current fiscal year ending March 2018, it expects to post an operating profit of Yen500 billion ($4.5 billion) with all business units contributing, said Chief Financial Officer Kenichiro Yoshida.

If so, it will meet a target set by Chief Executive Kazuo Hirai in his three-year plan that concludes in the current year.

"Each unit has been striving for high goals, and we think the midterm business plan's numerical goals are an important milestone for the group, " said Mr. Yoshida.

In the year ended March 2017, Sony recorded an operating profit of Yen289 billion and net profit of Yen73 billion.

Expectations for improved performance have helped push Sony shares up 15% year to date. For the current year, the biggest profit drivers are expected to be the PlayStation videogame business and Sony's financial-services business in Japan.

More than 60 million units of the PlayStation 4 have been sold since its introduction in 2013, keeping Sony ahead in its race with Nintendo Co. and Microsoft Corp. Network services such as software downloads and paid subscriptions are helping boost the videogame business further.

However, Sony faces tougher competition because Nintendo released its new Switch console in March and Microsoft plans to introduce its Scorpio console later this year.

Macquarie Capital Securities analyst Damian Thong said he expected Sony to release its next-generation PlayStation by the second half of 2018. The company has yet to disclose its plans.

Sony's semiconductor unit, which makes image sensors used in many of the world's smartphones, also expects to see higher profits this fiscal year. It already supplies sensors to higher-end handset makers such as Apple Inc. and Samsung Electronics Co., and now more mid- to lower-range smartphone makers are looking for Sony sensors because customers want to post high-quality pictures on social-networking sites.

Sony's operating profit has exceeded Yen500 billion only once, when it reached Yen526 billion in the year ended March 1998.

Businesses that previously dragged down results are looking up. The company's movie and television business is expected to post an operating profit of Yen39 billion in the current fiscal year, Sony said, after posting an operating loss of Yen80.5 billion in the year ended March 2017.

Former Fox television chief Tony Vinciquerra is a leading candidate to take over the business after the recent departure of longtime leader Michael Lynton, The Wall Street Journal reported Wednesday. Mr. Yoshida declined to comment.

Meanwhile, the consumer-electronics business, a longtime problem area, is set to contribute to profit, Sony said. Mr. Hirai, the CEO, has slimmed down the units and sold the Vaio personal computer business to an outside fund.

Write to Takashi Mochizuki at takashi.mochizuki@wsj.com